Mozilla Firefox ESR Portable (Legacy) 115.24.0
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Author:
Mozilla
Date: 05/29/2025 Size: 121 MB License: Open Source Requires: 10|8|7|Linux|macOS Downloads: 2741 times 
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Mozilla Firefox ESR (Extended Support Release) Portable (Legacy) is a long-term support build of Firefox, updated roughly every 42 weeks for significant changes and every 4 weeks for minor changes. Installer, Linux, and Mac versions are also available.
In other words, Mozilla Firefox ESR Portable is designed to be versions behind the current official release but with the latest security updates. It's for anyone who needs to use a previous build of Firefox safely. While you can download older builds manually going back to the first Firefox, they won't have the latest security updates.
Aside from the security updates included, you'll most likely not even notice that Mozilla Firefox ESR is behind the official release.
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In other words, Mozilla Firefox ESR Portable is designed to be versions behind the current official release but with the latest security updates. It's for anyone who needs to use a previous build of Firefox safely. While you can download older builds manually going back to the first Firefox, they won't have the latest security updates.
Aside from the security updates included, you'll most likely not even notice that Mozilla Firefox ESR is behind the official release.
Similar:
Version History for Mozilla Firefox ESR Portable (Legacy):
https://www.mozilla.org/en-US/firefox/115.24.0/releasenotes/
Editor's Note:
Mozilla Firefox ESR Portable (Legacy) does get a hit on VirusTotal. You may also get a warning from your antivirus that the file isn't commonly downloaded.
Firefox ESR 115 is now supported only on Windows 7-8.1 and macOS 10.12-10.14. See Release notes above.
Screenshot for Mozilla Firefox ESR Portable (Legacy)
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