Firefox Privacy Notice by Mozilla
This document is the Firefox Privacy Notice, explaining how Mozilla collects, processes, uses, and shares user data when you use the Firefox browser and its associated services. It details various data uses, from providing core browser functionality to improving security and marketing, and outlines your rights and choices regarding your personal data. The notice also covers data retention, international transfers, and how to manage your privacy settings.
Firefox Privacy Notice
Effective June 2, 2025
At Mozilla, we believe that privacy is fundamental to a healthy internet
That’s why we build Firefox, and all our products, to give you greater control over the information you share online and the information you share with us. In this Privacy Notice, we explain what data we process, how we process it, and for what purposes. Then, we explain how you can exercise choices about how we process your information.
How is your data used?
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.
More details, including how to adjust your data settings
You can read more detailed information about the information we collect for Desktop, Android or iOS. You can update your data collection settings for Desktop and Mobile at any time.
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.
More details, including how to adjust your data settings
Data processed on your device remains in your control. You can manage your browsing data and your local storage settings, or update your location permissions at any time.
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.
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