Welcome to the official community-maintained issue tracker for uBlock Origin (uBO).

For support, questions, or help, visit /r/uBlockOrigin.

If you encounter issues with filter lists or broken website functionality, please report them in the uAssets issue tracker.

For issues specific to the Manifest Version 3 (MV3) variant, use the uBOL issue tracker.

Performance issues without actual profiling data from the Firefox Profiler or Chromium Profiler will be marked as invalid and closed. Please provide a fully substantiated analysis to support your claims.

Do not open issues regarding WebRTC leaking local IP addresses. Supported modern browsers do not leak local IPs through WebRTC. uBO is not a VPN/proxy tool. If you experience such issues, report them to your browser or VPN/proxy software provider.

New filter list requests are not permitted and will be declined and closed.

Use the development builds to report issues and regressions before the next stable release. Once installed, development builds will automatically update to the latest version.

• Chromium: Install from the Chrome Web Store.
• Firefox: Download the latest uBlock0_[version].firefox.signed.xpi file from the uBO Releases page.
• Thunderbird: Download the latest uBlock0_[version].thunderbird.xpi from the uBO Releases page and drag-and-drop it into Thunderbird's Add-ons Manager pane (Thunderbird 91+ required).