Firefox ESR 91.9

Mozilla – 45.4MB – Freeware – Windows

Firefox ESR: Stability Meets Performance for Enterprises

David Fischer

02/24/2025

Firefox Extended Support Release (ESR) offers a reliable browser solution tailored for organizations that prioritize stability and security over the latest features.

Firefox ESR is a web browser developed and maintained by the Mozilla Foundation. It is intended for organizations and businesses that need a stable and secure version of Firefox with long-term support. ESR stands for Extended Support Release, which means that Mozilla provides updates and security patches for an extended period of time compared to the regular version of Firefox.

One of the main advantages of Firefox ESR is its compatibility with legacy web applications and add-ons, which is important for organizations that rely on older technologies. It also includes features such as automatic updates, customization options, and support for multiple platforms including Windows, macOS, and Linux.

Firefox ESR provides a familiar user interface with a toolbar to navigate through pages, an address bar to type in URLs, and tabs to switch between web pages.
It provides enhanced security features such as anti-phishing protection, automatic blocking of pop-up windows, and improved password management.
Firefox ESR also supports web standards such as HTML5, CSS3, and JavaScript, providing users with a fast and reliable browsing experience.

Firefox ESR is an ideal browser choice for organizations seeking a secure and long-term solution for their web browsing needs.

Overview

Firefox ESR is a Freeware software in the category Security developed by Mozilla.

The latest version of Firefox ESR is 91.9, released on 05/09/2022. It was initially added to our database on 01/23/2014.

Firefox ESR runs on the following operating systems: Windows. The download file has a size of 45.4MB.

Firefox ESR has not been rated by our users yet.

Pros

Extended Support Release (ESR) version provides more stable updates and longer support
Customizable with a wide range of add-ons and themes available
Strong focus on privacy and security features like Enhanced Tracking Protection and built-in password manager
Open-source software with active community support and regular updates
Cross-platform compatibility for Windows, macOS, Linux, and mobile devices

Cons

Can sometimes be slower compared to other browsers like Chrome and Edge
Not as resource-efficient in terms of memory usage as some competing browsers
Limited integration with some specific web applications that are optimized for other browsers
May have compatibility issues with certain websites or plugins due to its security-focused approach

FAQ

What is Firefox ESR?

Firefox ESR (Extended Support Release) is a version of Firefox specifically designed for organizations and developers who need extended support for mass deployments. It receives security updates on a regular basis but doesn't receive the rapid feature updates that the regular release of Firefox does.

How long is the support period for Firefox ESR?

Each version of Firefox ESR is supported for around one year. During this time, Mozilla provides security updates to keep the browser secure and safe to use.

Who should use Firefox ESR?

Firefox ESR is recommended for organizations and developers who require stability and long-term support for their browser deployments. It is not intended for casual, individual users who prefer the latest features and improvements.

How often are updates released for Firefox ESR?

Updates for Firefox ESR are released every six to eight weeks. These updates include security patches and bug fixes but do not introduce new features to maintain stability.

Can I still use add-ons and extensions with Firefox ESR?

Yes, most add-ons and extensions that are compatible with the regular release of Firefox can also be used with Firefox ESR. However, it's important to note that some add-ons may not be supported or updated by their developers for the ESR version.

Is Firefox ESR available on all platforms?

Firefox ESR is available for Windows, macOS, and Linux operating systems, making it accessible across a wide range of platforms.

Can I switch from regular Firefox to Firefox ESR without losing my bookmarks and settings?

Yes, you can switch from regular Firefox to Firefox ESR without losing your bookmarks, settings, or customizations. The process is seamless, and your data will be automatically transferred to the ESR version.

How can I report bugs or issues with Firefox ESR?

If you encounter any bugs or issues while using Firefox ESR, you can report them through the official Mozilla Bugzilla platform.

Does Firefox ESR have a dedicated support channel?

Yes, there is a dedicated support channel for Firefox ESR users. You can visit the Mozilla Support website, where you'll find resources, community forums, and knowledge articles specifically tailored for Firefox ESR.

What is the difference between regular Firefox and Firefox ESR?

The main difference between regular Firefox and Firefox ESR is their release cycle. Regular Firefox receives frequent updates with new features and improvements, while Firefox ESR focuses on providing stability and long-term support without rapidly introducing new features.

David Fischer

I am a technology writer for UpdateStar, covering software, security, and privacy as well as research and innovation in information security. I worked as an editor for German computer magazines for more than a decade before joining the UpdateStar team. With over a decade of editorial experience in the tech industry, I bring a wealth of knowledge and expertise to my current role at UpdateStar. At UpdateStar, I focus on the critical areas of software, security, and privacy, ensuring our readers stay informed about the latest developments and best practices.

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