1.66.4

gorhill/uBlock1.66.4Sep 15, 2025by github-actions[bot]

AI Summary

A maintenance release fixing a potential infinite loop scanner and expanding the `replace` option's flexibility.

Key Highlights

Fix potential infinite loop when scanning for `$` anchor
Allow generic exception for `replace=` option

New Features

Bug fixes and option improvements

Full Release Notes

[Commits to master since this release](https://github.com/gorhill/uBlock/compare/1.66.4...master)
[Commits since last release](https://github.com/gorhill/uBlock/compare/1.66.0...1.66.4)

To install the stable build:

- **Firefox**: Click [uBlock0_1.66.4.firefox.signed.xpi](https://addons.mozilla.org/firefox/downloads/file/4578681/ublock_origin-1.66.4.xpi)
    [uBO works best on Firefox](https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-best-on-Firefox)
- **Chromium**: Install from the Chrome store: <https://chrome.google.com/webstore/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm>
    - [About Google Chrome's "This extension may soon no longer be supported"](https://github.com/uBlockOrigin/uBlock-issues/wiki/About-Google-Chrome's-%22This-extension-may-soon-no-longer-be-supported%22)
    - As per [latest update from Google Chrome](https://developer.chrome.com/docs/extensions/develop/migrate/mv2-deprecation-timeline), MV2 support will be completely removed in [version 139](https://chromiumdash.appspot.com/schedule).
- **Edge**: Install from Microsoft Store: <https://microsoftedge.microsoft.com/addons/detail/odfafepnkmbhccpbejgmiehpchacaeak>
- **Opera**: Install from Opera addons: <https://addons.opera.com/en/extensions/details/ublock/>

---

- [Fix potential  infinite loop when scanning for `$` anchor](https://github.com/gorhill/uBlock/commit/889c0eb208)
- [Allow generic exception for `replace=` option](https://github.com/gorhill/uBlock/commit/52dba4116e)