# Zen Browser 1.21.14b — Release build - 1.21.14b (2026-08-11)

- Product: Zen Browser (https://whatsnew.fyi/product/zen-browser)
- Vendor: Zen Browser
- Date: 2026-08-13
- Version: 1.21.14b
- Original notes: https://github.com/zen-browser/desktop/releases/tag/1.21.14b
- Permalink: https://whatsnew.fyi/product/zen-browser/releases/1.21.14b

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'.

---

- **changed** — Update Firefox version to 153.0.4
- **added** — Add support for FFmpeg 63
- **fixed** — Fix feature callouts not using native panels
- **fixed** — Fix hang when using the same tab in 2 windows with different containers

#### Zen Stable Release


##### New Features
- Update Firefox version to 153.0.4
- Added support for FFmpeg 63

##### Fixes
- Fixed feature callouts not using native panels ([#14912](https://github.com/zen-browser/desktop/issues/14912))
- Fixed hang when using the same tab in 2 windows with different containers ([#14905](https://github.com/zen-browser/desktop/issues/14905))
- Other bug fixes and improvements.