uBlock Origin (uBO) Issues

This repository is the official community-maintained issue tracker for uBO.

Support Forum

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

Filter List Issues

Report issues with filter lists or broken website functionality in the uAssets issue tracker.

uBO Lite (uBOL) Issues

Report issues specific to the Manifest Version 3 (MV3) variant in the uBOL issue tracker.

Localization issues

Language translations are handled at Crowdin: https://crowdin.com/project/ublock

Performance Issues

Speculated performance issues are marked as invalid and closed if they do not come with actual profiling data from the Firefox Profiler (or Firefox Profiler for Chromium) and a fully substantiated analysis supporting the claim.

WebRTC Issues

Do not open issues about WebRTC leaking local IP addresses. Supported modern browsers do not cause undue local IP address leaks through WebRTC. uBO is not a VPN/proxy tool. If you are experiencing such an issue, report it to the browser or VPN/proxy tools software provider or, if needed, both.

Filter List Requests

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

uBO Development Builds

Use the development builds to help report issues and regressions before the next stable release.

Once you install a development build, it will automatically update when a new version is published.

• Chromium: Click the most recent uBlock0_[version].chromium.crx file from the uBO Releases page.

• Firefox: Click the most recent uBlock0_[version].firefox.signed.xpi file from the uBO Releases page.

• Thunderbird: Download the most recent uBlock0_[version].thunderbird.xpi file from the uBO Releases page, then drag-n-drop it into Thunderbird's Add-ons Manager pane (Thunderbird 91+ required).