Interaction data: Firefox sends data about your interactions with Firefox to us (such as number of open tabs and windows; number of webpages visited; number and type of installed Firefox Add-ons; and session length) and Firefox features offered by Mozilla or our partners (such as interaction with Firefox search features and search partner referrals).
Technical data: Firefox sends data about your Firefox version and language; device operating system and hardware configuration; memory, basic information about crashes and errors; outcome of automated processes like updates, safebrowsing, and activation to us. When Firefox sends data to us, your IP address is temporarily collected as part of our server logs.
Read the telemetry documentation for Desktop, Android, or iOS or learn how to opt-out of this data collection.
Firefox displays content, such as “Snippets” (messages from Mozilla), Top Sites (websites suggested by Mozilla for first-time Firefox users) and Pocket Recommendations.
Location data: Firefox uses your IP address to suggest relevant content based on your country.
Technical & Interaction data: Firefox sends us data such as the position, size and placement of content we suggest, as well as basic data about your interactions with Firefox’s suggested content. This includes the number of times suggested content is displayed or clicked.
Webpage data for Snippets: When you choose to click on a Snippet link, we may receive data about the link you followed. This information is not associated with any other information about you. Learn more.
Technical data for add-ons blocklist: Firefox for Desktop and Android periodically connect to Mozilla to protect you and others from malicious add-ons. Your Firefox version and language, device operating system, and list of installed add-ons are needed to apply and update the add-ons blocklist. Learn more.
Webpage and technical data to Google’s SafeBrowsing service: To help protect you from malicious downloads, Firefox sends basic information about unrecognized downloads to Google's SafeBrowsing Service, including the filename and the URL it was downloaded from.
Opting out increases the risk of your private information being intercepted. Learn more.
By default on desktop versions of Firefox, we will ask you to share a report with more detailed information about crashes with Mozilla, but you always have the choice to decline.
Sensitive data: Crash reports include a ‘dump file’ of Firefox’s memory contents at the time of the crash, which may contain data that identifies you or is otherwise sensitive to you.
Webpage data: Crash reports include the active URL at time of crash.
Technical data: Crash reports include data on why Firefox crashed and the state of device memory and execution during the crash.
Read the full documentation here.
On Desktop: Firefox by default sends Mozilla HTTP data that may be included with Firefox’s installer. This enables us to determine the website domain or advertising campaign (if any) that referred you to our download page. Read the documentation or opt-out before installation.
Read the documentation for iOS or Android, or learn how to disable this feature.
Learn more, including how to disable this feature.
Location data: For security purposes, we store the IP addresses you use to access your Firefox Account in order to approximate your city and country. We use this data to send you email alerts if we detect suspicious activity, such as account logins from other locations.
Interaction data: We receive data such as visits to and interaction with the Firefox Accounts website and menu preferences, and interactions with onboarding, email and SMS messages. Read more about Mozilla’s data practices for websites and email.
Technical data: To display which devices are synced to your Firefox Account and for functionality, we store your device operating system, browser and version, timestamp, locale, and the same information for devices connected to your account.
Read the full documentation or learn more, including how to delete your account.
Synced data: If you enable Sync, Mozilla receives the information that you sync across devices in encrypted form. This may include Firefox tabs, add-ons, passwords, payment autofill information, bookmarks, history, and preferences. Deleting your Firefox Account will delete related Firefox Sync content. You can also read the documentation.
Technical and Interaction data: If you enable sync, Firefox will periodically send basic information using Telemetry about the most recent attempt to sync your data, such as when it took place, whether it succeeded or failed, and what type of device is attempting to sync. You can also read the documentation.
Learn more, including how to enable or disable sync.
Screenshot uploads: Screenshots you choose to upload are sent to Mozilla and stored for the limited amount of time indicated, which you can change. We may access your uploaded screenshots when reasonably necessary for the operation of the service. You can delete your uploaded screenshots at any time.
Interaction data: We receive data such as visits to the Firefox Screenshots website, how often uploaded screenshots are accessed and shared by you or others, and your interactions with buttons, tiles, and mouse movements related to capturing screenshots.
For visits to the Firefox Screenshots website, our websites privacy notice describes the types of data we may additionally collect.
Read the full documentation or learn more.
Connection data: If you allow a website to send you notifications, Firefox connects with Mozilla and uses your IP address to relay the message. Mozilla cannot access the content of messages.
Interaction data: We receive aggregate data such as the number of Firefox subscriptions and unsubscriptions to website notifications, number of messages sent, timestamps, and senders (which may include specific website providers).
Read the full documentation or learn more, including how to revoke website notifications.
You can install Add-ons from addons.mozilla.org (“AMO”) or from the Firefox Add-ons Manager, which is accessible from the Firefox menu button in the toolbar.
Search queries: Search queries in the Add-on Manager are sent to Mozilla to provide you with suggested Add-ons.
Interaction data: We receive aggregate data about visits to the AMO website and the Add-ons Manager in Firefox, as well as interactions with content on those pages. Read about data practices on Mozilla websites.
Technical data for updates: Firefox periodically connects with Mozilla to install updates to Add-ons. Your installed Add-ons, Firefox version, language, and device operating system are used to apply the correct updates.
This privacy notice is for the most recent general release version of Firefox distributed by Mozilla. If you obtain Firefox elsewhere, or are running an older version, your copy of Firefox may contain different privacy characteristics.
Mozilla’s pre-release versions of Firefox (which are distributed through channels such as Nightly, Beta, Developer Edition and TestFlight) are development platforms frequently updated with experimental features and studies. In addition to the data collection described in this Privacy Notice, these versions by default may send certain types of web activity and crash data to Mozilla and in some cases to our partners. Any data collection or sharing adheres to our Firefox data collection policy and we will always be transparent and provide you with controls.