Mozilla Enforces Transparency Rules for Data Collection in New Firefox Extensions

Mozilla has announced a significant transparency initiative for its Firefox browser ecosystem, implementing mandatory data disclosure requirements for extension developers.

Starting November 3rd, 2025, all newly submitted Firefox extensions must explicitly declare their data collection and transmission practices within their code, marking a major step toward enhanced user privacy and informed consent.

New Manifest Requirements for Extension Developers

The compliance framework requires developers to specify data handling practices directly in the manifest.json file using the browser_specific_settings.gecko.data_collection_permissions key.

This technical implementation ensures that data policies are built into the extension itself rather than buried in external privacy documents.

Developers must indicate whether their extensions collect or transmit personal data, and those that do not engage in any data collection must explicitly declare this by setting the “none required” permission.

When users attempt to install a new extension, Firefox will automatically display this data collection information alongside ...