Firefox Data Stores

TL;DR

Firefox desktop has 45 separate data stores. Firefox for iOS has 5, and Firefox for Android has 2, in addition to stores shared with desktop.
Only 9 shared domain objects can be found on all 3 platforms. One of those, favicons, is present but not synced at all.
Firefox desktop has an entire SQLite database, storage.sqlite, that contains no tables. It is used entirely to reference the schema version value and uses that value to create the version number for the Storage directory.
Firefox desktop stores over 1200 preferences in a single, synchronously accessed file. This file is read from and written to from all over the application. Each individual write will cause the entire file to be written to disk at a later date.
Firefox for desktop utilises 10 different data storage formats. These are
1. SQLite
2. IndexedDB
3. Extensionless character-delimited files (AlternateServices, SiteSecurityServices, SecurityPreloadState)
4. JSON
5. .ini
6. .txt
7. .dat
8. .rdf
9. .xml
10. .js (prefs, sessionstore)
Three data stores contain only one item of information.
1. times.json
2. datareporting/state.json
3. healthreport/state.json
Of the data fields stored by desktop, only 8% of them are available to sync. Of data that is synced, desktop syncs 95% of fields, Android 90% and iOS 86%.

Desktop Data Stores

SQLite Stores

`places.sqlite`

Places is where the vast majority of synced data is stored. This database closely resembles the database structures on iOS and Android. The only data types that are synced that are not contained within places, are logins, form fields, add-ons (only desktop), prefs (only desktop), clients (synthetic), open tabs, and commands (synthetic, transient).

`content-prefs.sqlite`

Stores arbitrary data, or "preferences", associated with specific domains, or web "content".

`cookies.sqlite`

`favicons.sqlite`

Stores blob data for favicons for quick retrieval. This database is ATTACHed to places.sqlite.

`formhistory.sqlite`

Stores data entered into forms.

`kinto.sqlite`

Backing store for the blocklists code in the client. These lists represent addons, certificates, graphics drivers, and plugins which we should be careful not to trust, as well as "pinned" certificates we should trust. This local store is updated from a server periodically. It has the unfortunate name of "kinto" because this synchronization is performed using the Kinto server and client libraries. Because Kinto is an object store, the SQL schema is not especially helpful.

`storage-sync.sqlite`

Another Kinto-based SQLite store, this one supports our implementation of the browser.storage.sync API. This is just the local store; the synchronization happens with a server "in the cloud", of course. See https://wiki.mozilla.org/CloudServices/Sync/ExtensionStorage_Design_Doc for more information on how extension-storage information is stored in Kinto.

`permissions.sqlite`

Stores host, API, and clipboard permissions. See also content-prefs.sqlite.

`signons.sqlite`

The login manager has two backing store implementations: SQLite, which is used by Android, and a delayed-flush JSON file, used by desktop as of Bug 853549 in 2014. Android uses the SQLite implementation to support simultaneous access from Gecko and Android-side Sync code.

`storage.sqlite`

storage.sqlite is a completely empty database. It is opened and the schema version number checked and that version number is used as the version number for the storage directory. The storage directory is the directory that contains all of the data store files.

`webappsstore.sqlite`

Backing store for DOMStorage.

Key-Value Stores

AlternateServices

RFC 7838 Alternative Services. "Alt-Svc allows separation of transport routing from the origin host without using a proxy."

SiteSecurityServices, SecurityPreloadState

HSTS & HPKP storage.

`secmod.db`

The "legacy" security module database.

`key3.db`

Contains the key that is used to encrypt the Firefox passwords stored in logins.json. "Legacy", according to documentation. Android apparently sometimes uses key4.db, which is a SQLite replacement.

`cert7.db`

"Legacy" Network Security Services DB.

GMP/PBGP

Abouthome

The about:home snippet service is a simple, highly-cached content management service. It is intended to assemble and deliver content snippets to the about:home page in Firefox.

AppProjects

Data store for local apps.

devtools-async-storage

Simple key-value store for persisting values in devtools

About:reader

Stores cached article information for the about:reader page.

JSON file stores

sessionstore.js/recovery.js

Stores all browsing session state data for session restoration.

While Firefox is running, your live session is stored in recovery.js**. **sessionstore.js is created at shutdown.

{
  "windows": [
    {
      "tabs": [
        {
          "entries": [
            {
              "url": string,
              "title": string,
              "cacheKey": long,
              "ID": int,
              "docshellID": int,
              "referrer": string,
              "docIdentifier": int,
              "structuredCloneState": string,
              "structuredCloneVersion": int,
              "children": [
                {
                  "url": string,
                  "ID": int,
                  "docshellID": int,
                  "owner_b64": string,
                  "docIdentifier": int
                },
              ]
            }
          ],
          "lastAccessed": long,
          "hidden": bool,
          "attributes": {
          },
          "image": string,
          "index": int,
          "storage": {
            "<url>": {
              "ScribeTransport": string
            }
          },
          "formdata": {
            "xpath": {
              "<path>": string
            },
            "id": {
              "age-gate-year": {
                "selectedIndex": int,
                "value": string
              },
              "age-gate-month": {
                "selectedIndex": int,
                "value": string
              },
              "age-gate-day": {
                "selectedIndex": int,
                "value": string
              }
            },
            "url": string
          },
          "scroll": {
            "children": [
              {
                "scroll": stringint
              }
            ]
          },
        },
      "selected": int,
      "_closedTabs": [
        {
          "state": {
            "entries": [
              {
                  "url": string,
                  "title": string,
                  "cacheKey": long,
                  "ID": int,
                  "docshellID": int,
                  "referrer": string,
                  "docIdentifier": int,
                  "structuredCloneState": string,
                  "structuredCloneVersion": int,
                  "children": [
                    {
                      "url": string,
                      "ID": int,
                      "docshellID": int,
                      "owner_b64": string,
                      "docIdentifier": int
                    },
                ]
              }
            ],
            "lastAccessed": long,
            "userTypedValue": string,
            "userTypedClear": int,
            "hidden": bool,
            "attributes": {
            },
            "image": string,
            "index": int,
            "pageStyle": {
              "pageStyle": string
            },
            "scroll": {
              "scroll": string
            }
          },
          "title": string,
          "image": string,
          "pos": int,
          "closedAt": long
        }
      ],
      "busy": bool,
      "width": string,
      "height": string,
      "screenX": string,
      "screenY": string,
      "sizemode": string
    }
  ],
  "selectedWindow": int,
  "_closedWindows": [
      {
        tabs: [
          { 
            entries: [
              {
                url: string, 
                triggeringPrincipal_base64: string, 
                title: string 
              }
            ] 
          }
        ],
        selected: 2,
        title: "mozilla.org",
        _closedTabs: []
      },
  ],
  "session": {
    "lastUpdate": long,
    "startTime": long,
    "recentCrashes": int
  },
  "scratchpads": [ string ],
  "global": {
    
  }
}

addons.json

Compatible addons for this browser version.

containers.json

Details of the different containers currently in use.

xulstore.json

Stores information about toolbars, window positioning, and other interface elements in Firefox 34 and above.

`bookmarkbackups/*.jsonlz4`

Local backup of bookmarks.

`logins.json`

Contains all the stored username and password information for login manager. See also signons.sqlite.

`handlers.json`

Details of the different services available and how to connect to them.

`search.json`

Contains information about all of the search engines supported by the browser. This is used by all other search UI to retrieve query and configuration information about a specific search engine.

`signedInUser.json`

Contains information about the currently signed in Firefox Accounts user. This file is written by both desktop and Android codebases, but the code that does so is entirely different.

`extensions.json`

Contains information about installed web extensions.

`times.json`

Written by whichever code first creates the profile — Gecko or Firefox for Android — in order to set a lower bound on profile creation date for analytics. Originally supported Firefox Health Report. JSON to allow for additional fields to be added — e.g., to record "Refresh Firefox" events.

`datareporting/state.json`

Contains the client ID used to identify this installation for datareporting.

`healthreport/state.json`

Contains the client ID used to identify this installation for Firefox Health Report.

`sessionCheckpoints.json`

Records the profile state after every notification.

File Based Stores.

`compatibility.ini`

Contains a snapshot of browser version information for compatibility comparison.

`revocations.txt`

Contains a list of revoked certificates.

`persdict.dat`

Contains a list of words that have been added to the browser’s dictionary.

`cert-override.txt`

Contains user certificate exceptions.

`serviceworker.txt`

Contains information about installed service workers.

`pluginreg.dat`

Contains a list of installed plugins.

XML file stores.

`mimeTypes.rdf`

Contains associations between MIME types and application/save preferences. RDF/XML.8

`blocklist.xml`

Contains a list of addons, plugins, certificates, and graphics hardware and drivers that Firefox should exclude. Previously (?) stored in blocklist-{addons,gfx,plugins}.json.

Prefs

There are over 1000 preferences collected and stored in desktop Firefox. You can see a list of the preference keys in Appendix 1.

Android Data Stores

`browser.db`, `signedInUser.json`

See also discussion of signedInUser.json, times.json, and signons.sqlite, above.

Prefs

Android uses both Gecko's libpref store (prefs.js) and several Android SharedPreferences files, which are key-value pairs written to XML files with concurrency support provided by the Android frameworks.

iOS Data Stores

`browser.db`

`logins.db`, `ReadingList.db`, `signedInUser.json`

metadata.db was created but never used.

Prefs

applicationDidRequestUserNotificationPermissionPrefKey
backoff.storage
baseTimestamp
blockPopups
bookmarkvalidationattempt
clearprivatedata.toggles
CompactTabLayout
currentClient
feature_switches.<feature_id>
flowID
HomePageButtonIsInMenuPrefKey
HomePageURLPref
ids
initialPingSent
IntroViewControllerSeen
KeyDefaultHomePageURL
lastClientUpload
lastFetched
lastModified
lastRemoteTabSyncTime
lastSyncFinishTime
lastTabsUpload
latestAppVersion
MailToOption
NewTabPrefKey
nextOffset
NightModeButtonIsInMenuPrefKey
NightModeStatus
NoImageModeButtonIsInMenuPrefKey
NoImageModeStatus
offsetNewer
PrefKeyModel
PrefKeyPingCount
PrefKeyProfileDate
previousClients
readermode.style
recentlyClosedTabs
repair.aborted
repair.finished
repair.need-new-client
repair.sent
repair.sent-again
repairs.bookmark
saveLogins
search.disabledEngineNames
search.orderedEngineNames
search.suggestions.show
search.suggestions.showOptIn
settings.allowThirdPartyKeyboards
settings.closePrivateTabs
settings.sendUsageData
state
sync.scratchpad
timestamp
topSites.deletedSuggestedSites
topSitesCacheIsValid
topSitesCacheSize

… plus an array of preferences to manage Sync state. These are all written to UserDefaults, which is the iOS equivalent of the Android SharedPreferences system. These end up in .plist files on disk.

Firefox Sync storage format 5

Firefox Sync is a record-oriented system: the current state (and only the current state) of the connected devices' opted-in data is present as encrypted JSON objects on the server, keyed by a GUID. Data types correspond to collections on the server: e.g., login records are stored as objects in the passwords collection. Changes are observed by seeing a change in modified timestamp. Changes are retrieved by downloading the entirety of each modified record. New local changes are applied by uploading complete new records to the relevant collection.

See the datatypes companion document to see an overview of which data is synced between which platforms.

meta/global

Control structure for engine selection and versioning. One per account.

{
"engines" : {
"bookmarks" : {
"version" : int,
"syncID" : string
},
"forms" : {
"version" : int,
"syncID" : string
},
"tabs" : {
"version" : int,
"syncID" : string
},
"clients" : {
"version" : int,
"syncID" : string
},
"addons" : {
"version" : int,
"syncID" : string
},
"passwords" : {
"version" : int,
"syncID" : string
},
"history" : {
"version" : int,
"syncID" : string
},
"prefs" : {
"version" : int,
"syncID" : string
}
},
"syncID" : string,
"declined" : [
string
],
"storageVersion" : int
}

Keys

One object per account. Written to crypto/keys.

{
"default" : [ string ],
"collection" : string,
"id" : string,
"collections" : {
"string": string
}
}

Client

One per client. Expires after three weeks. Commands are sent to a client by writing them to its client record.

{
"commands" : [ {
"command" : string,
"args" : [ string ]
} ],
"protocols" : [ string ],
"application" : string,
"appPackage" : string,
"id" : string,
"os" : string,
"name" : string,
"fxaDeviceId" : string,
"version" : string,
"formfactor" : string,
"type" : string,
"device" : string
}

Forms

One per form entry.

{
"name" : string,
"value" : string
}

Tabs

One per client. All tabs for a device are written in a single array. The entire record is reuploaded when the set of open tabs changes.

{
"id" : string,
"clientName" : string,
"tabs" : [
{
"lastUsed" : string/decimalstring/integer,
"icon" : string,
"title" : string,
"urlHistory" : [ string ]
}
]
}

Passwords

One per login entry.

{
"httpRealm" : string,
"passwordField" : string,
"id" : string,
"password" : string,
"timeCreated" : ulong,
"formSubmitURL" : string,
"timeLastUsed" : ulong,
"timePasswordChanged" : ulong,
"usernameField" : string,
"hostname" : string,
"username" : string,
"timesUsed" : ulong
}

Bookmark

One per bookmark or folder.

{
"id" : string,
"parentid" : string,
"parentName" : string,
"title" : string,
"bmkUri" : string,
"siteUri" : string,
"feedUri" : string,
"type" : string,
"loadInSidebar" : bool,
"pos" : string,
"tags" : [ string ]
"children" : [ string ]
}

History

One per URL, containing a truncated array of visits (currently limited to 20). No way of representing the deletion of a visit.

{
"title" : string,
"histUri" : string,
"id" : string,
"visits" : [
{
"date" : integer,
"type" : integer
}
]
}

Prefs

One object per application (e.g., Firefox).

{
"value" :[{
"name" : string,
"value" : <type>,
}]
}

Addons

{
"addonID" : string,
"applicationID" : string,
"enabled" : bool,
"source" : string,
}

Appendices

Appendix 1 - Desktop Prefs

accessibility.accessfu.keyboard_echo
accessibility.accessfu.notify_output
accessibility.accessfu.quicknav_index
accessibility.accessfu.quicknav_modes
accessibility.accessfu.skip_empty_images
Accessibility.accessfu.utterance
accessibility.accesskeycausesactivation
accessibility.AOM.enabled
Accessibility.blockautorefresh
Accessibility.browsewithcaret
accessibility.browsewithcaret_shortcut.enabled
accessibility.delay_plugin_time
accessibility.delay_plugins
accessibility.force_disabled
accessibility.lastLoadDate
accessibility.loadedInLastSession
accessibility.mouse_focuses_formcontrol
Accessibility.screenreader
accessibility.tabfocus_applies_to_xul
accessibility.typeaheadfind
Accessibility.typeaheadfind.autostart
Accessibility.typeaheadfind.casesensitive
Accessibility.typeaheadfind.enablesound
Accessibility.typeaheadfind.enabletimeout
accessibility.typeaheadfind.flashBar
accessibility.typeaheadfind.linksonly
accessibility.typeaheadfind.matchesCountLimit
accessibility.typeaheadfind.prefillWithSelection
accessibility.typeaheadfind.soundURL
accessibility.typeaheadfind.startlinksonly
accessibility.typeaheadfind.timeout
accessibility.usebrailledisplay
accessibility.usetexttospeach
accessibility.warn_on_browsewithcaret
advanced.mailftp
alerts.showFavicons
app.feedback.baseURL
app.productInfo.baseURL
app.releaseNotesURL
app.support.baseURL
app.support.e10sAccessibilityUrl
app.update.altwindowtype
app.update.auto
app.update.backgroundMaxErrors
app.update.badgeWaitTime
app.update.cancelations.osx
app.update.cancelled
app.update.channel
app.update.checkInstallTime
app.update.checkInstallTime.days
app.update.disable_button.showUpdateHistory
app.update.doorhanger
app.update.download.attempts
app.update.download.backgroundInterval
app.update.download.promptMaxAttempts
app.update.elevate.attempts
app.update.elevate.never
app.update.elevation.promptMaxAttempts
app.update.enabled
app.update.idletime
app.update.interval
app.update.lastUpdateTime.\*
app.update.link.updateAvailableWhatsNew
app.update.link.updateManualWhatsNew
app.update.log
app.update.postupdate
app.update.promptWaitTime
app.update.service.enabled
app.update.silent
app.update.staging.enabled
app.update.timerFirstInterval
app.update.timerMinimumDelay
app.update.url
app.update.url.details
app.update.url.manual
application.use_ns_plugin_finder
apz.allow_checkerboarding
apz.allow_immediate_handoff
apz.allow_zooming
apz.axis_lock.breakout_angle
apz.axis_lock.breakout_threshold
apz.axis_lock.direct_pan_angle
apz.axis_lock.lock_angle
apz.axis_lock.mode
apz.content_response_timeout
apz.danger_zone_x
apz.danger_zone_y
apz.disable_for_scroll_linked_effects
apz.displayport_expiry_ms
apz.drag.enabled
apz.drag.initial.enabled
apz.enlarge_displayport_when_clipped
apz.fling_accel_base_mult
apz.fling_accel_interval_ms
apz.fling_accel_min_velocity
apz.fling_accel_supplemental_mult
apz.fling_curve_function_x1
apz.fling_curve_function_x2
apz.fling_curve_function_y1
apz.fling_curve_function_y2
apz.fling_curve_threshold_inches_per_ms
apz.fling_friction
apz.fling_min_velocity_threshold
apz.fling_stop_on_tap_threshold
apz.fling_stopped_threshold
apz.frame_delay.enabled
apz.keyboard.enabled
apz.max_velocity_inches_per_ms
apz.max_velocity_queue_size
apz.min_skate_speed
apz.minimap.enabled
apz.minimap.visbility.enabled
apz.one_touch_pinch.enabled
apz.overscroll.enabled
apz.overscroll.min_pan_distance_ratio
apz.overscroll.spring_friction
apz.overscroll.spring_stiffness
apz.overscroll.stop_distance_threshold
apz.overscroll.stop_velocity_threshold
apz.overscroll.stretch_factor
apz.paint_skipping.enabled
apz.peek_messages.enabled
apz.popups.enabled
apz.printtree
apz.record_checkerboarding
apz.scale_repaint_delay_ms
apz.test.logging_enabled
apz.touch_move_tolerance
apz.touch_start_tolerance
apz.velocity_bias
apz.velocity_relevance_time_ms
apz.x_skate_highmem_adjust
apz.x_skate_size_multipler
apz.x_stationary_size_multiplier
apz.y_skate_highmem_adjust
apz.y_skate_size_multiplier
apz.y_stationary_size_multiplier
apz.zoom_animation_duration_ms
beacon.enabled
bidi.browser.ui
bidi.direction
bidi.edit.caret_movement_style
bidi.edit.delete_immediately
bidi.numeral
bidi.texttype
bookmarks.initialized.pref
breakpad.reportURL
browser.aboutHomeSnippets.updateUrl
browser.active_color
browser.addon-watch.ignore
browser.altClickSave
browser.anchor_color
browser.audioFeeds.handler
browser.audioFeeds.handler.default
browser.audioFeeds.handlers.application
browser.audioFeeds.handlers.webservice
browser.autofocus
browser.backspace_action
browser.bookmarks.added_static_root
browser.bookmarks.autoExportHTML
browser.bookmarks.editDialog.firstEditField
browser.bookmarks.max_backups
browser.bookmarks.restore_default_bookmarks
browser.bookmarks.showMobileBookmarks
browser.bookmarks.showRecentlyBookmarked
browser.cache.auto_delete_cache_version
browser.cache.check_doc_frequency
browser.cache.compression_level
browser.cache.disk.{enable,capacity,filesystem_reported, free_space_hard_limit,free_space_soft_limit,hashstats_reported,max_chunks_memory_usage,max_entry_size,max_priority_chunks_memory_usage,metadata_memory_limit,preload_chunk_count,smart_size\*}
browser.cache.desk_cache_ssl
browser.cache.frecency_experiment
browser.cache.frecency_half_life_hours
browser.cache.max_shutdown_io_lag
browser.cache.memory.{enable,max_entry_size}
browser.cache.offline.capacity
browser.cache.offline.enable
browser.cache.use_new_backend
browser.cache.use_new_backend_temp
browser.casting.enabled
browser.chromeURL
browser.chrome.favicons
browser.chrome.image_icons.max_size
browser.chrome.site_icons
browser.chrome.toolbar_style
browser.chrome.toolbar_tips
browser.contentHandlers.types.0.title
browser.contentHandlers.types.0.type
browser.contentHandlers.types.0.uri
browser.contentHandlers.types.1.title
browser.contentHandlers.types.1.type
browser.contentHandlers.types.1.uri
browser.contentHandlers.types.2.title
browser.contentHandlers.types.2.type
browser.contentHandlers.types.2.uri
browser.contentHandlers.types.3.title
browser.contentHandlers.types.3.type
browser.contentHandlers.types.3.uri
browser.contentHandlers.types.4.title
browser.contentHandlers.types.4.type
browser.contentHandlers.types.4.uri
browser.contentHandlers.types.5.title
browser.contentHandlers.types.5.type
browser.contentHandlers.types.5.uri
browser.crashReports.unsubmittedCheck.autoSubmit
browser.crashReports.unsubmittedCheck.chancesUntilSuppress
browser.crashReports.unsubmittedCheck.enabled
browser.crashReports.unsubmittedCheck.lastShownDate
browser.ctrlTab.disallowForScreenReaders
browser.ctrlTab.previews
browser.customizemode.tip0.learnMoreUrl
browser.customizemode.tip0.shown
browser.defaultbrowser.notificationbar
browser.dictionaries.download.url
browser.display.background_color
browser.display.document_color_use
browser.display.focus_background_color
browser.display.focus_ring_on_anything
browser.display.focus_ring_style
browser.display.focus_text_color
browser.display.force_inline_alttext
browser.display.foreground_color
browser.display.normal_lineheight_calc_control
browser.display.show_image_placeholders
browser.display.show_loading_image_placeholder
browser.display.use_document_fonts
browser.display.use_focus_colors
browser.display.use_system_colors
browser.devedition.showCustomizeButton
browser.devedition.theme.enabled
browser.dictionaries.download.url
browser.disableResetPrompt
browser.display.document_color_use
browser.displayedE10SNotice
browser.displayedE10SPrompt.1
browser.dom.window.dump.enabled
browser.download.animateNotificatons
browser.download.folderList
browser.download.forbid_open_with
browser.download.hide_plugins_without_extensions
browser.download.importedFromSqlite
browser.download.lastDir
browser.download.loglevel
browser.download.manager.addToRecentDocs
browser.download.manager.resumeOnWakeDelay
browser.download.manager.showWhenStarting
browser.download.panel.firstSessionCompleted
browser.download.panel.shown
browser.download.progressDnldDialog.keepAlive
browser.download.saveLinkAsFilenameTimeout
browser.download.save_converter_index
browser.download.show_plugins_in_list
browser.download.useDownloadDir
browser.eme.ui.enabled
browser.eme.ui.firstContentShown
browser.enable_automatic_image_resizing
browser.enable_click_image_resizing
browser.esedbreader.loglevel
browser.EULA.version
browser.EULA.<version>.accepted
browser.feeds.handler
browser.feeds.handler.default
browser.feeds.handlers.application
browser.feeds.handlers.webservice
browser.feeds.showFirstRunUI
browser.fixup.alternate.enabled
browser.fixup.alternate.prefix
browser.fixup.alternate.suffix
browser.fixup.dns_first_for_single_words
browser.fixup.domainwhitelist.localhost
browser.fixup.hide_user_pass
browser.flash-protected-mode-flip.done
browser.flash-protected-mode-flip.enable
browser.formfill.adgedWeight
browser.formfill.boundaryWeight
browser.formfill.bucketSize
browser.formfill.debug
browser.formfill.enable
browser.formfill.expire_days
browser.formfill.maxTimeGroupings
browser.formfill.prefixWeight
browser.formfill.timeGroupingSize
browser.fullscreen.animateUp
browser.fullscreen.autohide
browser.geolocation.warning.infoURL
browser.gesture.pinch.in
browser.gesture.pinch.in.shift
browser.gesture.pinch.latched
browser.gesture.pinch.out
browser.gesture.pinch.out.shift
browser.gesture.pinch.threshold
browser.gesture.swipe.down
browser.gesture.swipe.left
browser.gesture.swipe.right
browser.gesture.swipe.up
browser.gesture.tap
browser.gesture.twist.end
browser.gesture.twist.latched
browser.gesture.twist.left
browser.gesture.twist.right
browser.gesture.twist.threshold
browser.hangNotification.waitPeriod
browser.helperApps.alwaysAsk.force
browser.helperApps.deleteTempFileOnExit
browser.helperApps.neverAsk.openFile
browser.helperApps.neverAsk.saveToDisk
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privacy.clearOnShutdown.formdata
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privacy.clearOnShutdown.offlineApps
privacy.clearOnShutdown.openWindows
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privacy.cpd.cookies
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privacy.popups.usecustom
privacy.resistFingerprinting
privacy.sanitize.migrateFx3Prefs
privacy.sanitize.sanitizeOnShutdown
privacy.sanitize.timeSpan
privacy.temporary_permission_expire_time_ms
privacy.trackingprotection.introCount
privacy.trackingprotection.introURL
privacy.trackingprotection.ui.enabled
privacy.usercontext.about_newtab_segregation.enabled
privacy.userContext.enabled
privacy.userContext.longPressBehavior"
privacy.userContext.ui.enabled
prompts.tab_modal.enabled
reader.errors.includeURLs
reader.parse-node-limit
security.allow_chrome_frames_inside_content
security.alternate_certificate_error_page
security.cert_pinning.enforcement_level
security.csp.enable
security.dialog_enable_delay
security.fileuri.strict_origin_policy
security.insecure_field_warning.contextual.enabled
security.insecure_password.ui.enabled
security.mixed_content.block_active_content
security.sandbox.content.level
security.sandbox.content.read_path_whitelist
security.sandbox.content.syscall_whitelist
security.sandbox.content.tempDirSuffix
security.sandbox.content.write_path_whitelist
security.sandbox.gpu.level
security.sandbox.logging.enabled
security.sandbox.windows.log.stackTraceDepth
security.view-source.reachable-from-inner-protocol
services.sync.autoconnectDelay
services.sync.username
services.sync.clients.devices.<desktop/mobile>
services.sync.prefs.sync.accessibility.blockautorefresh
services.sync.prefs.sync.accessibility.browsewithcaret
services.sync.prefs.sync.accessibility.typeaheadfind
services.sync.prefs.sync.accessibility.typeaheadfind.linksonly
services.sync.prefs.sync.addons.ignoreUserEnabledChanges
services.sync.prefs.sync.browser.ctrlTab.previews
services.sync.prefs.sync.browser.download.useDownloadDir
services.sync.prefs.sync.browser.formfill.enable
services.sync.prefs.sync.browser.link.open_newwindow
services.sync.prefs.sync.browser.newtabpage.enabled
services.sync.prefs.sync.browser.newtabpage.enhanced
services.sync.prefs.sync.browser.newtabpage.pinned
services.sync.prefs.sync.browser.offline-apps.notify
services.sync.prefs.sync.browser.safebrowsing.phishing.enabled
services.sync.prefs.sync.browser.safebrowsing.malware.enabled
services.sync.prefs.sync.browser.search.update
services.sync.prefs.sync.browser.sessionstore.restore_on_demand
services.sync.prefs.sync.browser.startup.homepage
services.sync.prefs.sync.browser.startup.page
services.sync.prefs.sync.browser.tabs.loadInBackground
services.sync.prefs.sync.browser.tabs.warnOnClose
services.sync.prefs.sync.browser.tabs.warnOnOpen
services.sync.prefs.sync.browser.urlbar.autocomplete.enabled
services.sync.prefs.sync.browser.urlbar.maxRichResults
services.sync.prefs.sync.browser.urlbar.suggest.bookmark
services.sync.prefs.sync.browser.urlbar.suggest.history
services.sync.prefs.sync.browser.urlbar.suggest.history.onlyTyped
services.sync.prefs.sync.browser.urlbar.suggest.openpage
services.sync.prefs.sync.browser.urlbar.suggest.searches
services.sync.prefs.sync.dom.disable_open_during_load
services.sync.prefs.sync.dom.disable_window_flip
services.sync.prefs.sync.dom.disable_window_move_resize
services.sync.prefs.sync.dom.event.contextmenu.enabled
services.sync.prefs.sync.extensions.personas.current
services.sync.prefs.sync.extensions.update.enabled
services.sync.prefs.sync.intl.accept_languages
services.sync.prefs.sync.layout.spellcheckDefault
services.sync.prefs.sync.lightweightThemes.selectedThemeID"
services.sync.prefs.sync.lightweightThemes.usedThemes
services.sync.prefs.sync.network.cookie.cookieBehavior
services.sync.prefs.sync.network.cookie.lifetimePolicy
services.sync.prefs.sync.network.cookie.lifetime.days
services.sync.prefs.sync.network.cookie.thirdparty.sessionOnly
services.sync.prefs.sync.permissions.default.image
services.sync.prefs.sync.pref.advanced.images.disable_button.view_image
services.sync.prefs.sync.pref.advanced.javascript.disable_button.advanced
services.sync.prefs.sync.pref.downloads.disable_button.edit_actions
services.sync.prefs.sync.pref.privacy.disable_button.cookie_exceptions
services.sync.prefs.sync.privacy.clearOnShutdown.cache
services.sync.prefs.sync.privacy.clearOnShutdown.cookies
services.sync.prefs.sync.privacy.clearOnShutdown.downloads
services.sync.prefs.sync.privacy.clearOnShutdown.formdata
services.sync.prefs.sync.privacy.clearOnShutdown.history
services.sync.prefs.sync.privacy.clearOnShutdown.offlineApps
services.sync.prefs.sync.privacy.clearOnShutdown.sessions
services.sync.prefs.sync.privacy.clearOnShutdown.siteSettings
services.sync.prefs.sync.privacy.donottrackheader.enabled
services.sync.prefs.sync.privacy.sanitize.sanitizeOnShutdown
services.sync.prefs.sync.privacy.trackingprotection.enabled
services.sync.prefs.sync.privacy.trackingprotection.pbmode.enabled
services.sync.prefs.sync.security.OCSP.enabled
services.sync.prefs.sync.security.OCSP.require
services.sync.prefs.sync.security.default_personal_cert
services.sync.prefs.sync.security.tls.version.min
services.sync.prefs.sync.security.tls.version.max
services.sync.prefs.sync.services.sync.syncedTabs.showRemoteIcons
services.sync.prefs.sync.signon.rememberSignons
services.sync.prefs.sync.spellchecker.dictionary
services.sync.prefs.sync.xpinstall.whitelist.required
services.sync.syncedTabs.showRemoteIcons
sidebar.position_start
signed.applets.codebase_principal_support
signon.schemeUpgrades
social.directories
social.share.activationPanelEnabled
social.shareDirectory
startup.homepage_override_url
startup.homepage_welcome_url
startup.homepage_welcome_url.additional
storage.nfs_filesystem
storage.vacuum.last.<filename>
storage.vacuum.last.index
toolkit.cosmeticAnimations.enabled
toolkit.crashreporter.infoURL
toolkit.datacollection.infoURL
toolkit.pageThumbs.minHeight
toolkit.pageThumbs.minWidth
toolkit.startup.max_resumed_crashes
toolkit.storage.pageSize
toolkit.storage.synchronous
toolkit.telemetry.archive.enabled
toolkit.telemetry.enabled
toolkit.telemetry.newProfilePing.enabled
toolkit.telemetry.shutdownPingSender.enabled
ui.click_hold_context_menus.delay
ui.caretBlinkTime
ui.caretWidth
ui.caretVisibleWithSelection
ui.submenuDelay
ui.dragThresholdX
ui.dragThresholdY
ui.useAccessibilityTheme
ui.menusCanOverlapOSBar
ui.useOverlayScrollbars
ui.scrollbarDisplayOnMouseMove
ui.scrollbarFadeBeginDelay
ui.scrollbarFadeDuration
ui.showHideScrollbars
ui.skipNavigatingDisabledMenuItem
ui.treeOpenDelay
ui.treeCloseDelay
ui.treeLazyScrollDelay
ui.treeScrollDelay
ui.treeScrollLinesMax
accessibility.tabfocus
ui.alertNotificationOrigin
ui.scrollToClick
ui.IMERawInputUnderlineStyle
ui.IMESelectedRawTextUnderlineStyle
ui.IMEConvertedTextUnderlineStyle
ui.IMESelectedConvertedTextUnderlineStyle
ui.SpellCheckerUnderlineStyle
ui.scrollbarButtonAutoRepeatBehavior
ui.tooltipDelay
ui.physicalHomeButton
ui.contextMenuOffsetVertical
ui.contextMenuOffsetHorizontal
ui.windowBackground
ui.windowForeground
ui.widgetBackground
ui.widgetForeground
ui.widgetSelectBackground
ui.widgetSelectForeground
ui.widget3DHighlight
ui.widget3DShadow
ui.textBackground
ui.textForeground
ui.textSelectBackground
ui.textSelectForeground
ui.textSelectForegroundCustom
ui.textSelectBackgroundDisabled
ui.textSelectBackgroundAttention
ui.textHighlightBackground
ui.textHighlightForeground
ui.IMERawInputBackground
ui.IMERawInputForeground
ui.IMERawInputUnderline
ui.IMESelectedRawTextBackground
ui.IMESelectedRawTextForeground
ui.IMESelectedRawTextUnderlin
ui.IMEConvertedTextBackground
ui.IMEConvertedTextForeground
ui.IMEConvertedTextUnderline
ui.IMESelectedConvertedTextBackground
ui.IMESelectedConvertedTextForeground
ui.IMESelectedConvertedTextUnderline
ui.SpellCheckerUnderline
ui.activeborder
ui.activecaption
ui.appworkspace
ui.background
ui.buttonface
ui.buttonhighlight
ui.buttonshadow
ui.buttontext
ui.captiontext
ui.graytext
ui.highlight
ui.highlighttext
ui.inactiveborder
ui.inactivecaption
ui.inactivecaptiontext"
ui.infobackground
ui.infotext
ui.menu
ui.menutext
ui.scrollbar
ui.threeddarkshadow
ui.threedface
ui.threedhighlight
ui.threedlightshadow
ui.threedshadow
ui.window
ui.windowframe
ui.windowtext
ui.-moz-buttondefault
ui.-moz-field
ui.-moz-fieldtext
ui.-moz-dialog
ui.-moz-dialogtext
ui.-moz-dragtargetzone
ui.-moz-cellhighlight
ui.-moz_cellhighlighttext
ui.-moz-html-cellhighlight
ui.-moz-html-cellhighlighttext
ui.-moz-buttonhoverface
ui.-moz_buttonhovertext
ui.-moz_menuhover
ui.-moz_menuhovertext
ui.-moz_menubartext
ui.-moz_menubarhovertext
ui.-moz_eventreerow
ui.-moz_oddtreerow
ui.-moz-mac-buttonactivetext
ui.-moz_mac_chrome_active
ui.-moz_mac_chrome_inactive
ui.-moz-mac-defaultbuttontext
ui.-moz-mac-focusring
ui.-moz-mac-menuselect
ui.-moz-mac-menushadow
ui.-moz-mac-menutextdisable
ui.-moz-mac-menutextselect
ui.-moz_mac_disabledtoolbartext
ui.-moz-mac-secondaryhighlight
ui.-moz-win-mediatext
ui.-moz-win-communicationstext
ui.-moz-nativehyperlinktext
ui.-moz-comboboxtext
ui.-moz-combobox
ui.key.accelKey
ui.key.chromeAccess
ui.key.contentAccess
ui.key.generalAccessKey
ui.key.menuAccessKey
ui.key.menuAccessKeyFocuses
urlclassifier.malwareTable
urlclassifier.phishTable
view_source.tab
webchannel.allowObject.urlWhitelist
xpinstall.customConfirmationUI
xpinstall.enabled
xpinstall.signatures.required
xpinstall.signatures.devInfoURL
xpinstall.whitelist.required

Appendix 2 - Synced Datatypes visualisation

https://docs.google.com/spreadsheets/d/1k9_K7Dc3q2h3SDV0vwjTgJou-ndza6WuobyJ1bbemtc/edit?ts=5977ab9d#gid=1269587388

Cheap and reliable Node.js hosting starts at $3/month, and $1/month static HTML hosting

mozilla / firefox-data-store-docs

Firefox Data Stores

TL;DR

Desktop Data Stores

SQLite Stores

places.sqlite

content-prefs.sqlite

cookies.sqlite

favicons.sqlite

formhistory.sqlite

kinto.sqlite

storage-sync.sqlite

permissions.sqlite

signons.sqlite

storage.sqlite

webappsstore.sqlite

Key-Value Stores

AlternateServices

SiteSecurityServices, SecurityPreloadState

secmod.db

key3.db

cert7.db

GMP/PBGP

Abouthome

AppProjects

devtools-async-storage

About:reader

JSON file stores

sessionstore.js/recovery.js

addons.json

containers.json

xulstore.json

bookmarkbackups/*.jsonlz4

logins.json

handlers.json

search.json

signedInUser.json

extensions.json

times.json

datareporting/state.json

healthreport/state.json

sessionCheckpoints.json

File Based Stores.

compatibility.ini

revocations.txt

persdict.dat

cert-override.txt

serviceworker.txt

pluginreg.dat

XML file stores.

mimeTypes.rdf

blocklist.xml

Prefs

Android Data Stores

browser.db, signedInUser.json

Prefs

iOS Data Stores

browser.db

logins.db, ReadingList.db, signedInUser.json

Prefs

Firefox Sync storage format 5

meta/global

Keys

Client

Forms

Tabs

Passwords

Bookmark

History

Prefs

Addons

Appendices

Appendix 1 - Desktop Prefs

Appendix 2 - Synced Datatypes visualisation

`places.sqlite`

`content-prefs.sqlite`

`cookies.sqlite`

`favicons.sqlite`

`formhistory.sqlite`

`kinto.sqlite`

`storage-sync.sqlite`

`permissions.sqlite`

`signons.sqlite`

`storage.sqlite`

`webappsstore.sqlite`

`secmod.db`

`key3.db`

`cert7.db`

`bookmarkbackups/*.jsonlz4`

`logins.json`

`handlers.json`

`search.json`

`signedInUser.json`

`extensions.json`

`times.json`

`datareporting/state.json`

`healthreport/state.json`

`sessionCheckpoints.json`

`compatibility.ini`

`revocations.txt`

`persdict.dat`

`cert-override.txt`

`serviceworker.txt`

`pluginreg.dat`

`mimeTypes.rdf`

`blocklist.xml`

`browser.db`, `signedInUser.json`

`browser.db`

`logins.db`, `ReadingList.db`, `signedInUser.json`