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+# Targeting attributes
+
+When you create ASRouter messages such as snippets, contextual feature recommendations, or onboarding cards, you may choose to include **targeting information** with those messages.
+
+Targeting information must be captured in [an expression](./targeting-guide.md) that has access to the following attributes. You may combine and compare any of these attributes as needed.
+
+Please note that some targeting attributes require stricter controls on the telemetry than can be colleted, so when in doubt, ask for review.
+
+## Available attributes
+
+* [activeNotifications](#activenotifications)
+* [addonsInfo](#addonsinfo)
+* [addressesSaved](#addressessaved)
+* [attachedFxAOAuthClients](#attachedfxaoauthclients)
+* [attributionData](#attributiondata)
+* [backgroundTaskName](#backgroundtaskname)
+* [blockedCountByType](#blockedcountbytype)
+* [browserSettings](#browsersettings)
+* [colorwaysActive](#colorwaysActive)
+* [creditCardsSaved](#creditcardssaved)
+* [currentDate](#currentdate)
+* [defaultPDFHandler](#defaultpdfhandler)
+* [devToolsOpenedCount](#devtoolsopenedcount)
+* [distributionId](#distributionId)
+* [doesAppNeedPin](#doesappneedpin)
+* [doesAppNeedPrivatePin](#doesappneedprivatepin)
+* [firefoxVersion](#firefoxversion)
+* [fxViewButtonAreaType](#fxviewbuttonareatype)
+* [hasAccessedFxAPanel](#hasaccessedfxapanel)
+* [hasActiveEnterprisePolicies](#hasactiveenterprisepolicies)
+* [hasMigratedBookmarks](#hasmigratedbookmarks)
+* [hasMigratedHistory](#hasmigratedhistory)
+* [hasMigratedPasswords](#hasmigratedpasswords)
+* [hasPinnedTabs](#haspinnedtabs)
+* [homePageSettings](#homepagesettings)
+* [inMr2022Holdback](#inmr2022holdback)
+* [isBackgroundTaskMode](#isbackgroundtaskmode)
+* [isChinaRepack](#ischinarepack)
+* [isDefaultBrowser](#isdefaultbrowser)
+* [isDefaultHandler](#isdefaulthandler)
+* [isDeviceMigration](#isdevicemigration)
+* [isFxAEnabled](#isfxaenabled)
+* [isFxASignedIn](#isFxASignedIn)
+* [isMajorUpgrade](#ismajorupgrade)
+* [isRTAMO](#isrtamo)
+* [isWhatsNewPanelEnabled](#iswhatsnewpanelenabled)
+* [locale](#locale)
+* [localeLanguageCode](#localelanguagecode)
+* [messageImpressions](#messageimpressions)
+* [needsUpdate](#needsupdate)
+* [newtabSettings](#newtabsettings)
+* [pinnedSites](#pinnedsites)
+* [platformName](#platformname)
+* [previousSessionEnd](#previoussessionend)
+* [profileAgeCreated](#profileagecreated)
+* [profileAgeReset](#profileagereset)
+* [profileRestartCount](#profilerestartcount)
+* [providerCohorts](#providercohorts)
+* [recentBookmarks](#recentbookmarks)
+* [region](#region)
+* [screenImpressions](#screenImpressions)
+* [searchEngines](#searchengines)
+* [sync](#sync)
+* [topFrecentSites](#topfrecentsites)
+* [totalBlockedCount](#totalblockedcount)
+* [totalBookmarksCount](#totalbookmarkscount)
+* [userEnabledActiveColorway](#userEnabledActiveColorway)
+* [userId](#userid)
+* [userMonthlyActivity](#usermonthlyactivity)
+* [userPrefersReducedMotion](#userprefersreducedmotion)
+* [useEmbeddedMigrationWizard][#useembeddedmigrationwizard]
+* [userPrefs](#userprefs)
+* [usesFirefoxSync](#usesfirefoxsync)
+* [xpinstallEnabled](#xpinstallEnabled)
+
+## Detailed usage
+
+### `addonsInfo`
+Provides information about the add-ons the user has installed.
+
+Note that the `name`, `userDisabled`, and `installDate` is only available if `isFullData` is `true` (this is usually not the case right at start-up).
+
+**Due to an existing bug, `userDisabled` is not currently available**
+
+#### Examples
+* Has the user installed the unicorn addon?
+```java
+addonsInfo.addons["unicornaddon@mozilla.org"]
+```
+
+* Has the user installed and disabled the unicorn addon?
+```java
+addonsInfo.isFullData && addonsInfo.addons["unicornaddon@mozilla.org"].userDisabled
+```
+
+#### Definition
+```ts
+declare const addonsInfo: Promise<AddonsInfoResponse>;
+interface AddonsInfoResponse {
+ // Does this include extra information requiring I/O?
+ isFullData: boolean;
+ // addonId should be something like activity-stream@mozilla.org
+ [addonId: string]: {
+ // Version of the add-on
+ version: string;
+ // (string) e.g. "extension"
+ type: AddonType;
+ // Version of the add-on
+ isSystem: boolean;
+ // Is the add-on a webextension?
+ isWebExtension: boolean;
+ // The name of the add-on
+ name: string;
+ // Is the add-on disabled?
+ // CURRENTLY UNAVAILABLE due to an outstanding bug
+ userDisabled: boolean;
+ // When was it installed? e.g. "2018-03-10T03:41:06.000Z"
+ installDate: string;
+ };
+}
+```
+### `attributionData`
+
+An object containing information on exactly how Firefox was downloaded
+
+#### Examples
+* Was the browser installed via the `"back_to_school"` campaign?
+```java
+attributionData && attributionData.campaign == "back_to_school"
+```
+
+#### Definition
+```ts
+declare const attributionData: AttributionCode;
+interface AttributionCode {
+ // Descriptor for where the download started from
+ campaign: string,
+ // A source, like addons.mozilla.org, or google.com
+ source: string,
+ // The medium for the download, like if this was referral
+ medium: string,
+ // Additional content, like an addonID for instance
+ content: string
+}
+```
+
+### `browserSettings`
+
+* `update`, which has information about Firefox update channel
+
+#### Examples
+
+* Is updating enabled?
+```java
+browserSettings.update.enabled
+```
+
+* Is beta channel?
+```js
+browserSettings.update.channel == 'beta'
+```
+
+#### Definition
+
+```ts
+declare const browserSettings: {
+ attribution: undefined | {
+ // Referring partner domain, when install happens via a known partner
+ // e.g. google.com
+ source: string;
+ // category of the source, such as "organic" for a search engine
+ // e.g. organic
+ medium: string;
+ // identifier of the particular campaign that led to the download of the product
+ // e.g. back_to_school
+ campaign: string;
+ // identifier to indicate the particular link within a campaign
+ // e.g. https://mozilla.org/some-page
+ content: string;
+ },
+ update: {
+ // Is auto-downloading enabled?
+ autoDownload: boolean;
+ // What release channel, e.g. "nightly"
+ channel: string;
+ // Is updating enabled?
+ enabled: boolean;
+ }
+}
+```
+
+### `currentDate`
+
+The current date at the moment message targeting is checked.
+
+#### Examples
+* Is the current date after Oct 3, 2018?
+```java
+currentDate > "Wed Oct 03 2018 00:00:00"|date
+```
+
+#### Definition
+
+```ts
+declare const currentDate; ECMA262DateString;
+// ECMA262DateString = Date.toString()
+type ECMA262DateString = string;
+```
+
+### `devToolsOpenedCount`
+Number of usages of the web console.
+
+#### Examples
+* Has the user opened the web console more than 10 times?
+```java
+devToolsOpenedCount > 10
+```
+
+#### Definition
+```ts
+declare const devToolsOpenedCount: number;
+```
+
+### `isDefaultBrowser`
+
+Is Firefox the user's default browser?
+
+#### Definition
+
+```ts
+declare const isDefaultBrowser: boolean;
+```
+
+### `isDefaultHandler`
+
+Is Firefox the user's default handler for various file extensions?
+
+Windows-only.
+
+#### Definition
+
+```ts
+declare const isDefaultHandler: {
+ pdf: boolean;
+ html: boolean;
+};
+```
+
+#### Examples
+* Is Firefox the default PDF handler?
+```ts
+isDefaultHandler.pdf
+```
+
+### `defaultPDFHandler`
+
+Information about the user's default PDF handler
+
+Windows-only.
+
+#### Definition
+
+```ts
+declare const defaultPDFHandler: {
+ // Does the user have a default PDF handler registered?
+ registered: boolean;
+
+ // Is the default PDF handler a known browser?
+ knownBrowser: boolean;
+};
+```
+
+### `firefoxVersion`
+
+The major Firefox version of the browser
+
+#### Examples
+* Is the version of the browser greater than 63?
+```java
+firefoxVersion > 63
+```
+
+#### Definition
+
+```ts
+declare const firefoxVersion: number;
+```
+
+### `locale`
+The current locale of the browser including country code, e.g. `en-US`.
+
+#### Examples
+* Is the locale of the browser either English (US) or German (Germany)?
+```java
+locale in ["en-US", "de-DE"]
+```
+
+#### Definition
+```ts
+declare const locale: string;
+```
+
+### `localeLanguageCode`
+The current locale of the browser NOT including country code, e.g. `en`.
+This is useful for matching all countries of a particular language.
+
+#### Examples
+* Is the locale of the browser any English locale?
+```java
+localeLanguageCode == "en"
+```
+
+#### Definition
+```ts
+declare const localeLanguageCode: string;
+```
+
+### `needsUpdate`
+
+Does the client have the latest available version installed
+
+```ts
+declare const needsUpdate: boolean;
+```
+
+### `pinnedSites`
+The sites (including search shortcuts) that are pinned on a user's new tab page.
+
+#### Examples
+* Has the user pinned any site on `foo.com`?
+```java
+"foo.com" in pinnedSites|mapToProperty("host")
+```
+
+* Does the user have a pinned `duckduckgo.com` search shortcut?
+```java
+"duckduckgo.com" in pinnedSites[.searchTopSite == true]|mapToProperty("host")
+```
+
+#### Definition
+```ts
+interface PinnedSite {
+ // e.g. https://foo.mozilla.com/foo/bar
+ url: string;
+ // e.g. foo.mozilla.com
+ host: string;
+ // is the pin a search shortcut?
+ searchTopSite: boolean;
+}
+declare const pinnedSites: Array<PinnedSite>
+```
+
+### `previousSessionEnd`
+
+Timestamp of the previously closed session.
+
+#### Definition
+```ts
+declare const previousSessionEnd: UnixEpochNumber;
+// UnixEpochNumber is UNIX Epoch timestamp, e.g. 1522843725924
+type UnixEpochNumber = number;
+```
+
+### `profileAgeCreated`
+
+The date the profile was created as a UNIX Epoch timestamp.
+
+#### Definition
+
+```ts
+declare const profileAgeCreated: UnixEpochNumber;
+// UnixEpochNumber is UNIX Epoch timestamp, e.g. 1522843725924
+type UnixEpochNumber = number;
+```
+
+### `profileAgeReset`
+
+The date the profile was reset as a UNIX Epoch timestamp (if it was reset).
+
+#### Examples
+* Was the profile never reset?
+```java
+!profileAgeReset
+```
+
+#### Definition
+```ts
+// profileAgeReset can be undefined if the profile was never reset
+// UnixEpochNumber is number, e.g. 1522843725924
+declare const profileAgeReset: undefined | UnixEpochNumber;
+// UnixEpochNumber is UNIX Epoch timestamp, e.g. 1522843725924
+type UnixEpochNumber = number;
+```
+
+### `providerCohorts`
+
+Information about cohort settings (from prefs, including shield studies) for each provider.
+
+#### Examples
+* Is the user in the "foo_test" cohort for snippets?
+```java
+providerCohorts.snippets == "foo_test"
+```
+
+#### Definition
+
+```ts
+declare const providerCohorts: {
+ [providerId: string]: string;
+}
+```
+
+### `region`
+
+Country code retrieved from `location.services.mozilla.com`. Can be `""` if request did not finish or encountered an error.
+
+#### Examples
+* Is the user in Canada?
+```java
+region == "CA"
+```
+
+#### Definition
+
+```ts
+declare const region: string;
+```
+
+### `searchEngines`
+
+Information about the current and available search engines.
+
+#### Examples
+* Is the current default search engine set to google?
+```java
+searchEngines.current == "google"
+```
+
+#### Definition
+
+```ts
+declare const searchEngines: Promise<SearchEnginesResponse>;
+interface SearchEnginesResponse: {
+ current: SearchEngineId;
+ installed: Array<SearchEngineId>;
+}
+// This is an identifier for a search engine such as "google" or "amazondotcom"
+type SearchEngineId = string;
+```
+
+### `sync`
+
+Information about synced devices.
+
+#### Examples
+* Is at least 1 mobile device synced to this profile?
+```java
+sync.mobileDevices > 0
+```
+
+#### Definition
+
+```ts
+declare const sync: {
+ desktopDevices: number;
+ mobileDevices: number;
+ totalDevices: number;
+}
+```
+
+### `topFrecentSites`
+
+Information about the browser's top 25 frecent sites.
+
+**Please note this is a restricted targeting property that influences what telemetry is allowed to be collected may not be used without review**
+
+
+#### Examples
+* Is mozilla.com in the user's top frecent sites with a frececy greater than 400?
+```java
+"mozilla.com" in topFrecentSites[.frecency >= 400]|mapToProperty("host")
+```
+
+#### Definition
+```ts
+declare const topFrecentSites: Promise<Array<TopSite>>
+interface TopSite {
+ // e.g. https://foo.mozilla.com/foo/bar
+ url: string;
+ // e.g. foo.mozilla.com
+ host: string;
+ frecency: number;
+ lastVisitDate: UnixEpochNumber;
+}
+// UnixEpochNumber is UNIX Epoch timestamp, e.g. 1522843725924
+type UnixEpochNumber = number;
+```
+
+### `totalBookmarksCount`
+
+Total number of bookmarks.
+
+#### Definition
+
+```ts
+declare const totalBookmarksCount: number;
+```
+
+### `usesFirefoxSync`
+
+Does the user use Firefox sync?
+
+#### Definition
+
+```ts
+declare const usesFirefoxSync: boolean;
+```
+
+### `isFxAEnabled`
+
+Does the user have Firefox sync enabled? The service could potentially be turned off [for enterprise builds](https://searchfox.org/mozilla-central/rev/b59a99943de4dd314bae4e44ab43ce7687ccbbec/browser/components/enterprisepolicies/Policies.jsm#327).
+
+#### Definition
+
+```ts
+declare const isFxAEnabled: boolean;
+```
+
+### `isFxASignedIn`
+
+Is the user signed in to a Firefox Account?
+
+#### Definition
+
+```ts
+declare const isFxASignedIn: Promise<boolean>
+```
+
+### `creditCardsSaved`
+
+The number of credit cards the user has saved for Forms and Autofill.
+
+#### Examples
+```java
+creditCardsSaved > 1
+```
+
+#### Definition
+
+```ts
+declare const creditCardsSaved: Promise<number>
+```
+
+### `addressesSaved`
+
+The number of addresses the user has saved for Forms and Autofill.
+
+#### Examples
+```java
+addressesSaved > 1
+```
+
+#### Definition
+
+```ts
+declare const addressesSaved: Promise<number>
+```
+
+### `xpinstallEnabled`
+
+Pref used by system administrators to disallow add-ons from installed altogether.
+
+#### Definition
+
+```ts
+declare const xpinstallEnabled: boolean;
+```
+
+### `hasPinnedTabs`
+
+Does the user have any pinned tabs in any windows.
+
+#### Definition
+
+```ts
+declare const hasPinnedTabs: boolean;
+```
+
+### `hasAccessedFxAPanel`
+
+Boolean pref that gets set the first time the user opens the FxA toolbar panel
+
+#### Definition
+
+```ts
+declare const hasAccessedFxAPanel: boolean;
+```
+
+### `isWhatsNewPanelEnabled`
+
+Boolean pref that controls if the What's New panel feature is enabled
+
+#### Definition
+
+```ts
+declare const isWhatsNewPanelEnabled: boolean;
+```
+
+### `totalBlockedCount`
+
+Total number of events from the content blocking database
+
+#### Definition
+
+```ts
+declare const totalBlockedCount: number;
+```
+
+### `recentBookmarks`
+
+An array of GUIDs of recent bookmarks as provided by [`NewTabUtils.getRecentBookmarks`](https://searchfox.org/mozilla-central/rev/c5c002f81f08a73e04868e0c2bf0eb113f200b03/toolkit/modules/NewTabUtils.sys.mjs#1059)
+
+#### Definition
+
+```ts
+interface Bookmark {
+ bookmarkGuid: string;
+ url: string;
+ title: string;
+ ...
+}
+declare const recentBookmarks: Array<Bookmark>
+```
+
+### `userPrefs`
+
+Information about user facing prefs configurable from `about:preferences`.
+
+#### Examples
+```java
+userPrefs.cfrFeatures == false
+```
+
+#### Definition
+
+```ts
+declare const userPrefs: {
+ cfrFeatures: boolean;
+ cfrAddons: boolean;
+ snippets: boolean;
+}
+```
+
+### `attachedFxAOAuthClients`
+
+Information about connected services associated with the FxA Account.
+Return an empty array if no account is found or an error occurs.
+
+#### Definition
+
+```
+interface OAuthClient {
+ // OAuth client_id of the service
+ // https://docs.telemetry.mozilla.org/datasets/fxa_metrics/attribution.html#service-attribution
+ id: string;
+ lastAccessedDaysAgo: number;
+}
+
+declare const attachedFxAOAuthClients: Promise<OAuthClient[]>
+```
+
+#### Examples
+```javascript
+{
+ id: "7377719276ad44ee",
+ name: "Pocket",
+ lastAccessTime: 1513599164000
+}
+```
+
+### `platformName`
+
+[Platform information](https://searchfox.org/mozilla-central/rev/c5c002f81f08a73e04868e0c2bf0eb113f200b03/toolkit/modules/AppConstants.sys.mjs#153).
+
+#### Definition
+
+```
+declare const platformName = "linux" | "win" | "macosx" | "android" | "other";
+```
+
+### `messageImpressions`
+
+Dictionary that maps message ids to impression timestamps. Timestamps are stored in
+consecutive order. Can be used to detect first impression of a message, number of
+impressions. Can be used in targeting to show a message if another message has been
+seen.
+Impressions are used for frequency capping so we only store them if the message has
+`frequency` configured.
+Impressions for badges might not work as expected: we add a badge for every opened
+window so the number of impressions stored might be higher than expected. Additionally
+not all badges have `frequency` cap so `messageImpressions` might not be defined.
+Badge impressions should not be used for targeting.
+
+#### Definition
+
+```
+declare const messageImpressions: { [key: string]: Array<UnixEpochNumber> };
+```
+
+### `blockedCountByType`
+
+Returns a breakdown by category of all blocked resources in the past 42 days.
+
+#### Definition
+
+```
+declare const messageImpressions: { [key: string]: number };
+```
+
+#### Examples
+
+```javascript
+Object {
+ trackerCount: 0,
+ cookieCount: 34,
+ cryptominerCount: 0,
+ fingerprinterCount: 3,
+ socialCount: 2
+}
+```
+
+### `isChinaRepack`
+
+Does the user use [the partner repack distributed by Mozilla Online](https://github.com/mozilla-partners/mozillaonline),
+a wholly owned subsidiary of the Mozilla Corporation that operates in China.
+
+#### Definition
+
+```ts
+declare const isChinaRepack: boolean;
+```
+
+### `userId`
+
+A unique user id generated by Normandy (note that this is not clientId).
+
+#### Definition
+
+```ts
+declare const userId: string;
+```
+
+### `profileRestartCount`
+
+A session counter that shows how many times the browser was started.
+More info about the details in [the telemetry docs](https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/concepts/sessions.html).
+
+#### Definition
+
+```ts
+declare const profileRestartCount: number;
+```
+
+### `homePageSettings`
+
+An object reflecting the current settings of the browser home page (about:home)
+
+#### Definition
+
+```ts
+declare const homePageSettings: {
+ isDefault: boolean;
+ isLocked: boolean;
+ isWebExt: boolean;
+ isCustomUrl: boolean;
+ urls: Array<URL>;
+}
+
+interface URL {
+ url: string;
+ host: string;
+}
+```
+
+#### Examples
+
+* Default about:home
+```javascript
+Object {
+ isDefault: true,
+ isLocked: false,
+ isCustomUrl: false,
+ isWebExt: false,
+ urls: [
+ { url: "about:home", host: "" }
+ ],
+}
+```
+
+* Default about:home with locked preference
+```javascript
+Object {
+ isDefault: true,
+ isLocked: true,
+ isCustomUrl: false,
+ isWebExt: false,
+ urls: [
+ { url: "about:home", host: "" }
+ ],
+}
+```
+
+* Custom URL
+```javascript
+Object {
+ isDefault: false,
+ isLocked: false,
+ isCustomUrl: true,
+ isWebExt: false,
+ urls: [
+ { url: "https://www.google.com", host: "google.com" }
+ ],
+}
+```
+
+* Custom URLs
+```javascript
+Object {
+ isDefault: false,
+ isLocked: false,
+ isCustomUrl: true,
+ isWebExt: false,
+ urls: [
+ { url: "https://www.google.com", host: "google.com" },
+ { url: "https://www.youtube.com", host: "youtube.com" }
+ ],
+}
+```
+
+* Web extension
+```javascript
+Object {
+ isDefault: false,
+ isLocked: false,
+ isCustomUrl: false,
+ isWebExt: true,
+ urls: [
+ { url: "moz-extension://123dsa43213acklncd/home.html", host: "" }
+ ],
+}
+```
+
+### `newtabSettings`
+
+An object reflecting the current settings of the browser newtab page (about:newtab)
+
+#### Definition
+
+```ts
+declare const newtabSettings: {
+ isDefault: boolean;
+ isWebExt: boolean;
+ isCustomUrl: boolean;
+ url: string;
+ host: string;
+}
+```
+
+#### Examples
+
+* Default about:newtab
+```javascript
+Object {
+ isDefault: true,
+ isCustomUrl: false,
+ isWebExt: false,
+ url: "about:newtab",
+ host: "",
+}
+```
+
+* Custom URL
+```javascript
+Object {
+ isDefault: false,
+ isCustomUrl: true,
+ isWebExt: false,
+ url: "https://www.google.com",
+ host: "google.com",
+}
+```
+
+* Web extension
+```javascript
+Object {
+ isDefault: false,
+ isCustomUrl: false,
+ isWebExt: true,
+ url: "moz-extension://123dsa43213acklncd/home.html",
+ host: "",
+}
+```
+
+### `activeNotifications`
+
+True when an infobar style message is displayed or when the awesomebar is
+expanded to show a message (for example onboarding tips).
+
+### `isMajorUpgrade`
+
+A boolean. `true` if the browser just updated to a new major version.
+
+### `hasActiveEnterprisePolicies`
+
+A boolean. `true` if any Enterprise Policies are active.
+
+### `userMonthlyActivity`
+
+Returns an array of entries in the form `[int, unixTimestamp]` for each day of
+user activity where the first entry is the total urls visited for that day.
+
+### `doesAppNeedPin`
+
+Checks if Firefox app can be and isn't pinned to OS taskbar/dock.
+
+### `doesAppNeedPrivatePin`
+
+Checks if Firefox Private Browsing Mode can be and isn't pinned to OS taskbar/dock. Currently this only works on certain Windows versions.
+
+### `isBackgroundTaskMode`
+
+Checks if this invocation is running in background task mode.
+
+### `backgroundTaskName`
+
+A non-empty string task name if this invocation is running in background task
+mode, or `null` if this invocation is not running in background task mode.
+
+### `userPrefersReducedMotion`
+
+Checks if user prefers reduced motion as indicated by the value of a media query for `prefers-reduced-motion`.
+
+### `inMr2022Holdback`
+
+A boolean. `true` when the user is in the Major Release 2022 holdback study.
+
+### `distributionId`
+
+A string containing the id of the distribution, or the empty string if there
+is no distribution associated with the build.
+
+### `fxViewButtonAreaType`
+
+A string of the name of the container where the Firefox View button is shown, null if the button has been removed.
+
+### `hasMigratedBookmarks`
+
+A boolean. `true` if the user ever used the Migration Wizard to migrate bookmarks.
+
+### `hasMigratedHistory`
+
+A boolean. `true` if the user ever used the Migration Wizard to migrate history.
+
+### `hasMigratedPasswords`
+
+A boolean. `true` if the user ever used the Migration Wizard to migrate passwords.
+
+### `useEmbeddedMigrationWizard`
+
+A boolean. `true` if the user is configured to use the embedded Migration Wizard in about:welcome.
+
+### `isRTAMO`
+
+A boolean. `true` when [RTAMO](first-run.md#return-to-amo-rtamo) has been used to download Firefox, `false` otherwise.
+
+### `isDeviceMigration`
+
+A boolean. `true` when [support.mozilla.org](https://support.mozilla.org) has been used to download the browser as part of a "migration" campaign, for device migration guidance, `false` otherwise.
+### `screenImpressions`
+
+An array that maps about:welcome screen IDs to their most recent impression timestamp. Should only be used for unique screen IDs to avoid unintentionally targeting messages with identical screen IDs.
+#### Definition
+
+```
+declare const screenImpressions: { [key: string]: Array<UnixEpochNumber> };
+```