Mozilla Firefox ESR (eo): download ældre versioner

Version 153.4.0, first offered to ESR channel users on September 29, 2026
Firefox 153 Extended Support Release (ESR) includes all of the enhancements since Firefox 140, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

- Reference link to ESR 153.0 release notes.

Version 153.3.0, first offered to ESR channel users on September 15, 2026
Firefox 153 Extended Support Release (ESR) includes all of the enhancements since Firefox 140, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

- Reference link to ESR 153.0 release notes.

Version 153.2.0, first offered to ESR channel users on September 1, 2026
Firefox 153 Extended Support Release (ESR) includes all of the enhancements since Firefox 140, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

- Reference link to ESR 153.0 release notes.

Version 153.1.0, first offered to ESR channel users on August 18, 2026
Firefox 153 Extended Support Release (ESR) includes all of the enhancements since Firefox 140, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

- Reference link to ESR 153.0 release notes.

Version 153.0esr, first offered to ESR channel users on July 21, 2026
Firefox 153 Extended Support Release (ESR) includes all of the enhancements since Firefox 140, along with many new features to make your enterprise deployments easier and even more flexible.

General
- Firefox now includes a new profile management system that helps you separate your online life into distinct profiles for work, school, vacation planning, or whatever you choose. Profiles can be customized with names, avatars, and color themes while keeping tabs, bookmarks, passwords, and browsing history separate. Built-in profile backup and restore also makes it easier to migrate to a new device or recover your browsing data.
- Split View lets you view two webpages side-by-side in a single browser window, with additional options to quickly open links in Split View, rearrange pages, and search open tabs.
- The Firefox address bar has gained several new capabilities, including built-in unit and time zone conversion, quick actions such as muting all browser audio, and direct search results as you type.
- Firefox now supports copying links directly to highlighted text on a webpage for easier sharing.
- Firefox Settings has been redesigned with improved organization and navigation, making it easier to find and customize browser preferences.

AI
- Firefox introduced several new AI-powered features, including on-device tab organization, AI-assisted link previews, integrated AI search, and centralized controls for managing AI features. Whenever possible, these features perform processing locally to help protect user privacy.

Sidebar and Tabs
- Firefox continues to improve tab management with enhancements to vertical tabs, tab groups, and the sidebar.
- Tab groups have gained numerous usability improvements, including better support for collapsed groups, previews of grouped tabs, and additional organization options.
- Passwords can now be accessed directly from the Firefox sidebar without opening a separate tab.
- Firefox now supports copying links from one or multiple background tabs directly from the tab context menu, and multiple tabs can be copied or shared in a single action.
- A Send Tab toolbar button is now available through Customize Toolbar.

Security & Privacy
- Firefox has significantly expanded Fingerprinting Protection, making it harder for websites to uniquely identify users in both Standard and Strict Enhanced Tracking Protection modes.
- Enhanced Tracking Protection includes stronger protections against bounce tracking and additional safeguards that restrict websites from accessing local network resources without user permission.
- Firefox now uses Safe Browsing V5 for phishing and malware protection.
- Firefox Password Manager now uses stronger AES-256 encryption to protect stored logins on disk.
- Private Browsing has been enhanced with new controls, including the ability to instantly end a private browsing session and temporarily relax tracker blocking for individual sites when needed for compatibility.

Translations
- Firefox has expanded on-device translation support with many additional languages and continued improvements to translation quality.
- A dedicated translations page now provides an easy way to perform real-time translations directly within Firefox.

Accessibility
- Firefox continues to improve accessibility with enhanced support for assistive technologies, including Windows UI Automation, improved keyboard navigation, more accessible date and time controls, and better support for mathematical content in PDFs.

Windows
- Firefox now supports installing websites as standalone web apps pinned to the Windows taskbar.
- Firefox web apps are also available for Microsoft Store installations.
- Firefox now better integrates with Windows location permissions when websites request geolocation access.

We're still preparing the notes for this release, and will post them here when they are ready. Please check back later.

Version 140.13.0, first offered to ESR channel users on July 21, 2026
Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

Version 140.12.0, first offered to ESR channel users on June 16, 2026
Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

Version 140.11.0, first offered to ESR channel users on May 19, 2026
Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

We’re still preparing the notes for this release, and will post them here when they are ready. Please check back later.

We’re still preparing the notes for this release, and will post them here when they are ready. Please check back later.

Version 140.10.0, first offered to ESR channel users on April 21, 2026
Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

Version 140.9.1, first offered to ESR channel users on April 7, 2026
Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

Version 140.9.0, first offered to ESR channel users on March 24, 2026
Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

Fixed
- Various security fixes.

Developer

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Improved reliability when HTTP/3 connections fail: Firefox no longer forces HTTP/2 during fallback, allowing the server to choose the protocol and preventing stalls on some sites. (Bug 1980812)
Developer

- Reference link to ESR 140.3.0 release notes.

Fixed
- Various security fixes.
Developer

- Reference link to 140.0esr release notes.

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Security Fixes.
Developer

Fixed
- Various security fixes.
Developer

Unresolved
- Due to recent changes in Chrome on Windows, some users might find that the Firefox migration wizard no longer successfully imports passwords from Chrome or Chrome-based browsers. As a workaround, you can export your passwords as a CSV file from Chrome and then import them into Firefox using either the migration wizard or the Firefox password manager.

Fixed
- Various security fixes.
Developer

Fixed
- Security fix.
Developer

- Reference link to ESR 128.8.0 release notes.

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Various security fixes.
Developer

Fixed
- Fixed a crash experienced by Windows users with Qihoo 360 Total Security Antivirus software installed (bug 1934258)
Developer

- Reference link to ESR 128.5.1 release notes.

Fixed
- Fixed an issue that prevented some websites from loading when using SSL Inspection. (bug 1933747)
Developer

- Reference link to ESR 128.5 release notes.

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Security fix.
Developer

- Reference link to 128.0esr release notes.

Fixed
- Various security fixes and other quality improvements.
Developer

- Reference link to 128.0esr release notes.

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Changed
- The root certificate used to verify add-ons and signed content has been renewed to avoid upcoming expiration.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Security fix.
Developer

- Reference link to ESR 115.9 release notes.

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer

Fixed
- Various security fixes and other quality improvements.
Developer