Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations like universities and businesses that need to set up and maintain Firefox on a large scale. Firefox ESR does not come with the latest features but it has the latest security and stability fixes.

Get the Firefox Extended Support Release or Rapid Release browser for comprehensive data security and data protection.

Your data stays your business

The Firefox browser is open source, provides Enhanced Tracking Protection and soon will support DNS over HTTPS --- all part of our longstanding commitment to data protection.

Deploy when and how you want

With install packages and a wide expansion of group policies and features, deployment is faster and more flexible than ever --- and a breeze in Windows and macOS environments.

Choose your release cadence

Get rapid releases to make sure you get the latest features faster, or go extended to ensure a super stable experience.

What's New

Firefox version 115 will be the last supported Firefox version for users of Windows 7, Windows 8, Windows 8.1, macOS 10.12 (Sierra), macOS 10.13 (High Sierra) and macOS 10.14 (Mojave). If you are using these versions of Windows or macOS you will be moved to the Firefox Extended Support Release (ESR) channel by an application update. Mozilla will provide security updates for Firefox 115 ESR until at least 115.27.0esr in August 2025, when the position will be re-evaluated.

Why has Firefox ended support for Windows 7, 8 and 8.1 users?

Microsoft ended official support for Windows 7, 8 and 8.1 in January of 2023. Unsupported operating systems receive no security updates and have known exploits. With no official support from Microsoft, maintaining Firefox for obsolete operating systems becomes costly for Mozilla and dangerous for users.

Will switching to a different browser keep me protected?

No. Most browsers, including Google Chrome and Microsoft Edge, have already ended support for Windows 7, 8 and 8.1.

Can I still browse safely with Firefox Windows 7, 8 and 8.1?

Mozilla is providing critical security updates through the Firefox ESR channel up until the end of ESR version 115, August 2025. After this, no security updates are provided and you are strongly encouraged to move to a supported version of Microsoft Windows.

How can I get the newest features of Firefox?

If you want to keep your Firefox up to date, with all the latest features and updates, you need to upgrade your operating system to Windows 10 or higher. In some cases, Microsoft may require newer hardware in order to support the newer operating system. After upgrading, users can easily reinstall Firefox and keep all of their settings.

Firefox ESR 140.0 Release Notes:

New

  • Vertical Tabs: You can now keep more - or fewer - pinned tabs in view for quicker access to important windows. Just drag the divider to resize your pinned tabs section.
  • Custom Search Engines: Firefox now supports adding even more search engines. To add a custom engine, right-click a search field of a supported website and select "Add Search Engine", or go to Settings > Search > Add (below the search shortcuts table) to manually enter a search URL.
  • Firefox Extensions: Customize your toolbar with the option to remove the extensions shortcut, giving you more control over your browser. When the button is hidden, you can access the extensions panel again at any time from the Firefox menu by clicking the Extensions menu item.
  • You can now unload tabs by right-clicking on a tab (or multiple selected tabs) and selecting "Unload Tab". This can speed up performance by reducing Firefox's memory and CPU usage.
  • Full-Page Translations now prioritizes translating only the content near your current view, improving speed and responsiveness. Content outside your view is skipped unless you scroll to it, reducing unnecessary resource usage.
  • Firefox builds in Arabic now come with a built-in Arabic dictionary for the Firefox spellchecker.
  • Address autofill enabled for users in Italy, Poland, and Austria.

Fixed

  • Various security fixes.

Changed

  • The Pocket toolbar icon, as well as the Pocket integrations on New Tab, have been removed per the service shutdown announcement.

Enterprise

Developer

  • Improved the search feature in the Inspector panel to help developers more effectively search the DOM of the current page. Sorting the results by the number of matching elements, support "pseudo" selector state, etc.

Web Platform

  • Added platform support for aria-keyshortcuts in Linux, macOS, and Windows.
  • Added support for the CookieStore API, an asynchronous cookie API for scripts running in HTML documents and service workers.
  • Added support for the Custom Highlight API, which allows styling arbitrary text ranges. Support for text-decoration is not included and is planned for an upcoming release.
  • Added support for the pointerrawupdate event. This event provides lower-latency access to pointer movements by firing as soon as the pointer data is available, typically before the main pointermove event. Unlike pointermove, it performs an additional hit test to determine the target and fires more frequently, which may impact performance even if only a listener is added. This event is intended for applications that require high-precision input handling and cannot achieve smooth interaction using coalesced pointermove events alone.
  • Service Workers are now available in Private Browsing Mode. This enhancement builds on our efforts to support IndexedDB and the DOM Cache API in Private Browsing through encrypted storage. With this change, more websites, especially those that rely on background tasks, will be able to benefit from Service workers.
  • Firefox now applies a uniform user agent (UA) style to 'h1' elements, regardless of whether they are used inside 'article', 'aside', 'nav', or 'section'.
  • Firefox will now escape less-than (<) and greater-than (>) symbols when serializing HTML attributes, making certain mXSS attacks on websites more difficult.