# Firefox 153.1.0esr

- Product: Firefox (https://whatsnew.fyi/product/firefox)
- Vendor: Mozilla
- Date: 2026-08-18
- Version: 153.1.0esr
- Original notes: https://www.mozilla.org/en-US/firefox/153.1.0/releasenotes/
- Permalink: https://whatsnew.fyi/product/firefox/releases/153.1.0esr

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.

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- **security** — Various security fixes

###### Fixed
- Various security fixes.
###### Developer
- Developer Information
- Reference link to ESR 153.0 release notes.