To provide you with the Firefox browser

Mozilla collects certain data, like technical and settings data, to provide the core functionality of the Firefox browser and associated services, distinguish your device from others, remember and respect your settings, and provide you with default features such as New Tab, PDF editing, password manager and Total Cookie Protection. You can further customize your Firefox experience by adjusting your controls, buttons, and toolbars and adding features with add-ons.

Some Firefox features, like automated translation for web pages and “alt-text” suggestions when you upload images in your PDFs, are powered by artificial intelligence (AI) based on small language models downloaded to your device. These operate locally — web page content, PDFs, images and tab URLs stay on your device and are not sent to Mozilla’s servers or used for training purposes without your explicit consent. Note that other Firefox features may integrate third-party AI models, as further detailed in this Notice.

To adapt Firefox to your needs

Firefox processes a variety of personal data in a way that does not leave your device, such as browsing history, web form data, temporary internet files, and cookies. This means the data stays on your device and is not sent to Mozilla’s servers unless it says otherwise in this Notice. If you choose to allow it, your precise location may also be processed for location-related functionality for websites like Google Maps; this data is only accessed from your device by the website(s) you choose to enable it for — it is not sent to Mozilla's servers.

To provide and improve search functionality

When you perform a search in Firefox, your search query, device data and location data will be processed by your default search engine (according to their applicable Privacy Notice) to provide your search results and search suggestions. Mozilla generally receives royalties when you use one of the default or optional search options in the Firefox web browser.

Firefox also shows its own search suggestions based on information stored on your local device (including recent search terms, open tabs, and previously visited URLs). These suggestions may include sponsored suggestions from Mozilla’s partners, relevant content from common internet resources (such as Wikipedia), or relevant URLs that are popular in your country. Mozilla processes certain technical and interaction data, such as how many searches you perform, how many sponsored suggestions you see and whether you interact with them. Mozilla's partners receive de-identified information about interactions with the suggestions they've served. You can enable or disable Search suggestions at any time.

Depending on your location, Mozilla derives the high level category (e.g., travel, shopping) of your search from keywords in that query, in order to understand the types and number of searches being made. We utilize privacy preserving technologies such that Mozilla only learns that someone, somewhere, performed a search relating to a particular category, without knowing who. Learn more about how we categorize searches, including how to opt out.

Mozilla may also receive location-related keywords from your search (such as when you search for “Boston”) and share this with our partners to provide recommended and sponsored content. Where this occurs, Mozilla cannot associate the keyword search with an individual user once the search suggestion has been served and partners are never able to associate search suggestions with an individual user. You can remove this functionality at any time by turning off Sponsored Suggestions — more information on how to do this is available in the relevant Firefox Support page.

You may be able to opt into an enhanced search experience, which will result in Mozilla processing additional personal data, including your technical data, location and search data. Some of that information may be shared with our partners on a de-identified and/or aggregated basis. See our “Data and Firefox Suggest” blog post for more details.

To serve relevant content and advertising on Firefox New Tab

We use technical data, language preference, and location to serve content and advertising on the Firefox New Tab page (referred to as home page on mobile) in the correct format (i.e. for mobile vs desktop), language, and relevant location. Mozilla collects technical and interaction data, such as the position, size, views and clicks on New Tab content or ads, to understand how people are interacting with our content and to personalize future content, including sponsored content. This data may be shared with our advertising partners on a de-identified or aggregated basis.

In some instances, when ads are enabled on New Tab, additional browsing data may also be processed locally on your device to measure the effectiveness of those ads; such data will only be shared with Mozilla and/or our advertising partners via our privacy-preserving technologies on an aggregated and/or de-identified basis.

When a user visits a third-party website by clicking an advertisement or link in Firefox, that site may use cookies and other web APIs available to any website to collect data subject to that website’s privacy and/or cookie notices.

To provide Mozilla accounts

If you sign up for a Mozilla account, we process additional information alongside the data set out in this Notice, such as account details, contact information and sync data, in accordance with the Mozilla Accounts Privacy Notice.

To provide AI chatbots

You have the option to use a third-party AI chatbot of your choice to help you with things like summarizing what you’re reading, writing and brainstorming ideas, subject to that provider’s terms of use and privacy notice.

If you choose to enable a chatbot in the sidebar and/or through a shortcut, Mozilla does not have access to your conversations or the underlying content you input into the selected chatbot. We do collect technical and interaction data on how this feature is used to help improve Firefox, such as how often each third-party chatbot provider is chosen, how often suggested prompts are used, and the length of selected text.

To provide Review Checker, including serving sponsored content

Review Checker is a Firefox feature that helps you determine whether reviews are reliable when you shop online with sites like Amazon.com, BestBuy.com and Walmart.com. If you opt in to using Review Checker, Mozilla will process information about the website and the product identifier of the products you view using our privacy preserving technology called OHTTP. OHTTP combines encryption and a third party intermediary server, helping prevent Mozilla from linking you or your device to the products you have viewed. We also collect technical and interaction data on how this feature is used to help improve Firefox.

By opting in to using Review Checker you also agree to be shown product recommendations and sponsored content. If you do not want to receive product recommendations and sponsored content, you can opt out of this feature under Review Checker settings at any time.

To provide and enable add-ons (addons.mozilla.org)

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. We process your search queries in the Add-ons Manager to be able to provide you with suggested add-ons. If you choose to install any add-ons, Firefox will process technical, location and settings data, and periodically connect with Mozilla’s servers to install and apply the correct updates to your add-ons. We also collect technical and interaction data on usage of add-ons, to help improve Firefox.

When you visit the AMO website, Mozilla collects technical and interaction data about your usage of the site in accordance with our Mozilla Websites, Communications and Cookies notice.

To maintain and improve features, performance and stability

Mozilla runs studies within Firefox and makes certain experimental features available through Firefox Labs to test different features and ideas before they’re made available to all Firefox users or become part of the core Firefox offering — this allows us to make more informed decisions about what our users want and need. This research uses technical, system performance, location, settings and interaction data.

We also need to process data to keep Firefox operational, improve features and performance, and identify, troubleshoot and diagnose issues. For this we use technical, location and settings data, as well as interaction and system performance data (such as number of tabs open, memory usage or the outcome of automated processes like updates). In the rare situations where the information needed also includes limited browsing data (e.g., Top Level Domain annotations for page-load performance monitoring), it will be transmitted using OHTTP; this helps prevent Mozilla from linking you or your device to the data collected for this purpose.

On Desktop and Android, if Firefox encounters an unexpected issue, the Mozilla Crash Reporter will also ask if you wish to send us additional information, which may include sites that were open at the time of the crash and other browsing data. On Desktop and Android if you opt in to sending us crash reports automatically, we collect this information without prompting you each time; on iOS, crash reports contain less information and are sent automatically to us by default. You can change your settings at any time.

To improve security

Because maintaining the latest version of Firefox helps keep you safe against vulnerabilities, desktop versions of Firefox regularly connect to Mozilla’s servers (or another service that you used to install Firefox) to check for software updates; updates for Android and iOS versions of Firefox are managed by Google’s Play Store and Apple’s App Store, respectively.

We also process technical data and settings data to protect against malicious add-ons. In addition to these standard processes, we use Google’s Safe Browsing Service to protect you from malicious downloads and phishing attacks, and validate web page and technical data with Certificate Authorities. As part of our work to improve privacy and security for all internet users, we collect technical data via OHTTP, to better understand, prevent and defend against fingerprinting.

For some Firefox users, Firefox routes DNS requests to a resolver service that has agreed to Mozilla’s strict privacy standards for resolvers. This provides added protection from privacy leaks to local networks and also from certain DNS security attacks. System logs of your DNS requests are deleted from the service within 24 hours and are only used for the purpose of DNS resolution. Learn more about DNS over HTTPS.

To understand usage of Firefox

We process data to better understand how you engage with our services, such as how much you use Firefox, your language preference, how often you use our search tools or interact with search suggestions, how fast pages load for you and how many ads or CAPTCHAs you see. This allows us to measure how people access and use our services, which helps improve our business and the functionality of Firefox.

To market our services

When you allow us to do so, Firefox sends Mozilla data about the website domain or specific advertising campaign (if any) that referred you to our download page to help us understand and improve our marketing efforts. Firefox also shares information with our marketing partners to measure and improve these campaigns; what information is specifically shared varies (depending on how you discovered Firefox and your operating system) but generally includes how you were referred to our download page and whether you actively use Firefox. Where Firefox is pre-installed on your device, technical and interaction data (your device type and whether Firefox is used) will be sent to our marketing partners, and shared with Mozilla.

To pseudonymize, de-identify, aggregate or anonymize data

As part of the activities outlined above, such as understanding usage of Firefox and measuring our marketing, we may create pseudonymous, de-identified, aggregated or anonymized data. We use technology that is appropriate to the circumstances, including identifier removal, OHTTP, or DAP — these help prevent data from being linked to you. In some cases, we may share or publish aggregated and anonymized data to facilitate research or as part of the lawful business purposes outlined above (such as sharing aggregated insights with advertising partners).

To communicate with you

Depending on your settings (and whether or not you have a Mozilla account), we may communicate with you via in-product messaging, send you communications (including marketing-related communications), or ask you to participate in research / surveys, or respond to customer support communications. You may also reach out to us directly, such as to report a broken site within Firefox. When you send us personal data via these methods, we will use the information only for the purpose you provided it. We also process interaction data related to these communications to better understand who has received our service-related announcements (such as new features, updates or security alerts).

To comply with applicable laws, and identify and prevent harmful, unauthorized or illegal activity

We may also be required to process your personal data to comply with applicable laws and protection purposes, such as:

• Responding to lawful requests and complying with legal processes, such as responding to subpoenas, investigations, or requests from government authorities. Mozilla requires a valid Legal Process to compel the disclosure of specific user data to a government.
• Responding to requests to exercise privacy rights, such as your right to access or delete your personal data.
• Identifying, investigating and addressing potential fraudulent activities, or other harmful activities such as illegal activities, cyberattacks or intellectual property infringement (including filing or defending legal claims).
• Performing internal compliance and security activities, such as audits and enterprise security management.

Your rights

As a Firefox user, you have the right to:

1. Be informed about what data we process about you, why and who it’s shared with (that’s this Notice!)
2. Request a copy of the data we have about you
3. Request portability of your data
4. Request correction of any data we hold about you that is inaccurate or incomplete
5. Have personal data we hold about you deleted (in certain circumstances)
6. In some cases, restrict or object to how we use your personal data
7. Complain to your relevant data protection authority if you have concerns about how we’re handling your personal data. We’d prefer it if you contact us first (via dpo@mozilla.com), but you can also reach out to your relevant EU data protection authority, or search for (and contact) your local data protection authority

To make any of the above requests regarding your personal data, please contact us (Mozilla Corporation) through our Data Subject Access Request Portal; we will never discriminate against anyone for exercising their privacy rights. If you have any other questions regarding personal data or our privacy practices, please contact us at compliance@mozilla.com.

If you’re in the UK or EEA, you can also contact our Data Protection Officer at dpo@mozilla.com, or by mail at:

Bird & Bird DPO Services SRL
Avenue Louise 235 b 1
1050 Brussels
Belgium

We respond to all requests we receive from individuals wishing to exercise their data protection rights in accordance with applicable data protection laws, and we may need to ask you for additional information to confirm your identity before we can proceed with your request.

Please note that, when you request deletion of your Firefox data, it will be deleted within 30 days of the request (with the exception of Interaction Data, which has a standard retention period of 90 days and is automatically deleted at the end of this period).

Your choices

You can update your data collection settings for Desktop and Mobile at any time.

Firefox also provides Global Privacy Control (GPC), which you can enable to automatically notify websites not to sell or share information about your browsing session on that website. GPC operates as a “Do Not Sell” mechanism in some US states such as California, Colorado and Connecticut. It may also be used to indicate an opt-out of targeted advertising or general request to limit the sale or sharing of your personal data in those jurisdictions, as well as in jurisdictions such as the EU, UK, Nevada, Utah and Virginia.

Applicability

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).

Changes

We may need to change this policy and our notices, in which case the updates will be posted online and we will update the effective date of this notice. If the changes are substantive, we will also announce the update more prominently through Mozilla's usual channels for such announcements, such as blog posts and forums.