Firefox Add-Ons Must Declare Data Collection—or Be Rejected

Firefox Add-Ons Must Declare Data Collection—or Be Rejected

From Daily Security Review by Daily Security Review

October 28, 2025 · 29 min · Episode 320

About this episode

Mozilla requires Firefox extensions to disclose data collection practices to enhance user transparency and control.

Mozilla is taking a decisive step toward transparency and user control by requiring all Firefox extensions to disclose how they collect and handle personal data. The new mandate introduces a dedicated key— browser_specific_settings.gecko.data_collection_permissions —that every extension must include in its manifest file. Whether or not an extension collects data, developers must explicitly declare their practices, ensuring there is no room for ambiguity. This policy introduces what many are calling a “privacy nutrition label” for browser add-ons, allowing users to see data collection details before installation. The information will be prominently displayed both on the addons.mozilla.org extension listing pages and within Firefox’s about:addons management interface. By placing this information front and center, Mozilla is giving users the ability to make more informed decisions about which extensions they trust with their data. For developers, compliance isn’t optional. Any extension that fails to properly declare its data collection policies will be rejected during the signing process , blocking it from distribution through Mozilla’s add-on store. Even extensions that support…

Topics covered

  • data collection
  • privacy
  • browser extensions
  • user control
  • transparency

Keywords

  • Firefox
  • data collection
  • privacy nutrition label
  • Mozilla
  • browser extensions

Mentioned in this episode

Organizations: Mozilla, addons.mozilla.org, Mozilla’s add-on store

Products: Firefox, Firefox extensions

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