Mozilla Firefox (en-US) is a Open Source Windows program in the Browsers category, developed by Mozilla. The current version is 155.0.1; you can download it safely from its official source with the download button above.
Firefox Browser, also known as Mozilla Firefox or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. In 2017, Firefox began incorporating new technology under the code name Quantum to promote parallelism and a more intuitive user interface. Firefox is officially available for Windows 7 or newer, macOS, and Linux. Its unofficial ports are available for various Unix and Unix-like operating systems including FreeBSD, OpenBSD, NetBSD, illumos, and Solaris Unix.
✨ Features
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📝 Release notes (155.0.1)
Version 155.0.1, first offered to Release channel users on September 4, 2026
Fixed
- Fixed Firefox becoming unresponsive on some pages that use CSS blur and backdrop filters together. (Bug 2068836)
- Fixed the sidebar not reappearing after restarting Firefox when the "Hide tabs and sidebar" option was turned on. (Bug 2065431)
- Fixed some profile icons not being displayed in the account and application menus. (Bug 2064729, Bug 2067734)
- Fixed the current device being listed among connected devices in the account menu. (Bug 2059763)
- Reference link to 155.0 release notes.
Unresolved
- Standard dynamic range (SDR) video in some formats can appear washed out on macOS. The issue is under investigation and a fix will ship in a future release. (Bug 2068961)
SHA-256: 27A24FCDDE805CB6A34C5C102E98EBFE5F0302078202376D2828F8797ED80298
