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Mozilla Mandates Data Collection Disclosure for New Firefox Extensions

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Mozilla will require Firefox extension developers to disclose data collection practices starting November 3, 2025. Developers must specify data collection in the manifest.json file. This information will be visible to users during installation and on the extension's listing page. Existing extensions will need to comply when updated. Non-compliant extensions will be blocked from submission.

Timeline

  1. 24.10.2025 16:17 1 articles · 23h ago

    Mozilla Requires Data Collection Disclosure for New Firefox Extensions

    Starting November 3, 2025, Mozilla will mandate that Firefox extension developers disclose data collection practices in the manifest.json file. This requirement will apply to new extensions and existing ones when they update to the new framework in the first half of 2026. Non-compliant extensions will be blocked from submission. Users will see this information during the installation prompt and on the extension's listing page, ensuring transparency about data practices.

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