Mozilla Firefox 155.0
Release notes and official download link · released 1 September 2026
Download installer (opens publisher site in a new tab)
archive.mozilla.org · opens in a new tab
Download Mozilla Firefox 155.0
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Windows
| Platform | Released | Download |
|---|---|---|
| Windows x64 | 1 September 2026 | Download installer (opens publisher site in a new tab) |
macOS
| Platform | Released | Download |
|---|---|---|
| macOS Universal | 1 September 2026 | Download installer (opens publisher site in a new tab) |
What’s in Mozilla Firefox 155.0
Major release. Release notes: https://www.mozilla.org/en-US/firefox/155.0/releasenotes/
About this version
Mozilla Firefox 155.0 was released on 1 September 2026. It is number 6 from the newest of the 6 versions recorded for Mozilla Firefox, and is available for Windows x64, macOS Universal. Mozilla Firefox is Open source (MPL-2.0) software published by www.mozilla.org.