For example, the Windows registry or other installed programs may expect Firefox to be in the default location (e.g., C:\Program Files\Mozilla Firefox or C:\Program Files (x86)\Mozilla Firefox on 64-bit Windows). You can install Firefox in the same location to minimize any side effects. Make sure to remove the Firefox installation directory. Versions that end in b (e.g., 19.0b6) are Beta releases, intended for users who are testing pre-release versions.
0.3esr) are Extended Support Release versions intended for organizations. Release versions that end in esr (e.g., Firefox 17.
Download the version you want from or Note: If you are looking for an older version of a Firefox "final" release, look for a download with no letter suffix (e.g., 18.0.2 is the last final release version previous to 19.0). Mozilla®, Firefox® and the Firefox logo are registered trademarks of the Mozilla Foundation and are used with permission.To downgrade to an old version of Firefox, back up your Firefox profile first, as a precaution, and then follow these steps: Source Code: Launcher source (included), Firefox source. License: Free / Open Source (Launcher: GPL Firefox: MPL). System Requirements: Windows XP/Vista/7/8/10, Wine on Linux/UNIX. Version 45 (ESR) - Security Patches Through June 13, 2017įor help getting Firefox Portable up and running, visit Firefox Portable Support. Visit the Firefox Portable Legacy 52 - 52.9.0 homepage. Version 52 (ESR) - Security Patches Through June 21, 2018 Visit the Firefox Portable Legacy 68 - 68.12.0 homepage. Version 68 (ESR) - Security Patches Through August 18, 2020 Visit the Firefox Portable Legacy 78 - 78.14.0 homepage. Version 78 (ESR) - Security Patches Through Sept 8, 2021 Visit the Firefox Portable Legacy 91 - 91.13.0 homepage. 
Mozilla Firefox, Portable Edition legacy editions works best with the Platform Version 91 (ESR) - Security Patches Through Aug 22, 2022 Individual users should use standard Mozilla Firefox, Portable Edition. These versions are not support by and may have known bugs and security issues. Mozilla Firefox®, Portable Edition legacy editions are available for web developer and extension developers to test against.
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