# uBlock Origin 1.73.1b6

- Product: uBlock Origin (https://whatsnew.fyi/product/ublock-origin)
- Vendor: Raymond Hill
- Date: 2026-08-21
- Version: 1.73.1b6
- Original notes: https://github.com/gorhill/uBlock/releases/tag/1.73.1b6
- Permalink: https://whatsnew.fyi/product/ublock-origin/releases/1.73.1b6
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **removed** — Remove support for `cap_user_stylesheet`
- **changed** — Improve scriptlets framework
- **added** — Add `env_brave` preparser token
- **added** — Add set/unset/given cookie values
- **added** — Add procedural operator `content(...)`, to lookup elements inside `template` tags
- **changed** — Improve `prevent-clipboard-write` scriptlet
- **changed** — Improve `json-edit` scriptlet
- **changed** — Revisit scriptlets' `getExtraArgs` implementation

- [Remove support for `cap_user_stylesheet`](https://github.com/gorhill/uBlock/commit/fb09b0947d)
- [Improve scriptlets framework](https://github.com/gorhill/uBlock/commit/57ade5f484)
- [Add `env_brave` preparser token](https://github.com/gorhill/uBlock/commit/0c56103a40) (by @ryanbr)
- [Add set/unset/given cookie values](https://github.com/gorhill/uBlock/commit/a796fd7daf) (by @ryanbr)
- [Add procedural operator `content(...)`, to lookup elements inside `template` tags](https://github.com/gorhill/uBlock/commit/25d413803d)
- [Improve `prevent-clipboard-write` scriptlet](https://github.com/gorhill/uBlock/commit/8a85e04907)
- [Improve `json-edit` scriptlet](https://github.com/gorhill/uBlock/commit/0fdbfdb2b5)
- [Revisit scriptlets' `getExtraArgs` implementation](https://github.com/gorhill/uBlock/commit/505fbc7a75)

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[Commits to Master Since This Release](https://github.com/gorhill/uBlock/compare/1.73.1b6...master)

###### How to Install the Developer Build:

- **Firefox**: Download the build from [uBlock0_1.73.1b6.firefox.signed.xpi](https://github.com/gorhill/uBlock/releases/download/1.73.1b6/uBlock0_1.73.1b6.firefox.signed.xpi)
  uBO works best on Gecko-based browsers, check out [why](https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-best-on-Firefox)
- **Chromium**: Install directly from the [Chrome Web Store](https://chromewebstore.google.com/detail/ublock-origin-development/cgbcahbpdhpcegmbfconppldiemgcoii)