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Mozilla will require Firefox extension creators to publicly disclose what user data they collect or share with third parties. The new rules will take effect on November 3, 2025, and will be mandatory for all developers in the first half of 2026.
Developers will now be required to add a separate browser_specific_settings.gecko.data_collection_permissions parameter to each manifest.json file, listing the categories of information collected. These include names, email addresses, search queries, as well as data on visited sites and browsing activity. If the extension does not track the user at all, this will also need to be disclosed.
Mozilla explains that the browser will automatically read this data from the manifest and display it to the user upon installation, along with a list of requested permissions. This information will also appear on the extension's page at addons.mozilla.org, as well as in the "Permissions and Data" management section on the Firefox about page.:addons.
Users will be able to either agree to or decline data collection, similar to how permissions are currently granted for various browser features. Currently, the new requirements only affect new extensions, and developers of existing add-ons are not required to comply until their products are updated to use the new framework. Add-ons that contain incorrect (or missing) data collection information will not be accepted by moderation and will be returned with an error and explanation. Mozilla states that these changes are another step towards greater transparency and user security. Firefox is thus moving toward a model where users know in advance what data the extension developer is interested in and can decide for themselves whether to install such an add-on. @xakep.ru
Developers will now be required to add a separate browser_specific_settings.gecko.data_collection_permissions parameter to each manifest.json file, listing the categories of information collected. These include names, email addresses, search queries, as well as data on visited sites and browsing activity. If the extension does not track the user at all, this will also need to be disclosed.
Mozilla explains that the browser will automatically read this data from the manifest and display it to the user upon installation, along with a list of requested permissions. This information will also appear on the extension's page at addons.mozilla.org, as well as in the "Permissions and Data" management section on the Firefox about page.:addons.
Users will be able to either agree to or decline data collection, similar to how permissions are currently granted for various browser features. Currently, the new requirements only affect new extensions, and developers of existing add-ons are not required to comply until their products are updated to use the new framework. Add-ons that contain incorrect (or missing) data collection information will not be accepted by moderation and will be returned with an error and explanation. Mozilla states that these changes are another step towards greater transparency and user security. Firefox is thus moving toward a model where users know in advance what data the extension developer is interested in and can decide for themselves whether to install such an add-on. @xakep.ru