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Firefox Legacy

Note: If you have Mac OS X 10.7 (Lion) or 10.6 (Snow Leopard), you will need to download OS X El Capitan before you can upgrade to the latest Mac OS. While insecure versions of Firefox will continue to work on OS X 10.8 and earlier, using an up-to-date version of Firefox on a supported version of Mac OS will provide you with the best and safest.

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  • Firefox Release. Version 78.0, first offered to Release channel users on June 30, 2020. Firefox 78 is the last major release with support for macOS versions 10.9, 10.10 and 10.11. If you use one of these versions, you’ll be supported through Firefox ESR (Extended Support Release) 78.x for the coming year.
  • Get the not-for-profit-backed browser on Windows, Mac or Linux. Mozilla Firefox 71.0 for Mac OS X Download Free (2020. Explorer 7, cidermac os x, 9 and 10. Firefox for Mac OS Download Latest Version (2021) Free Jan 29, 2018 I have Mac 10.7.5 and I can't get a newer OS and I need to know which version of.

Firefox Legacy is an unofficial modified version of Mozilla Firefox that works on older Mac OS X versions, including 10.6 Snow Leopard, 10.7 Lion, and 10.8 Mountain Lion.

Download it now and breathe new life into your old Mac.

OS X 10.8 Mountain Lion

Current version for OS X 10.8 Mountain Lion: 71.0p2 (2020-09-15)
IMPORTANT NOTE ABOUT UPDATING TO v71: A new Firefox profile will be created when you update from earlier versions to version 71.0. To restore your previous data, type 'about:profiles' in the address bar, then find your previous profile (if you can't tell which, try each one) and set it as default. Then, restart Firefox Legacy. I apologize for the inconvenience; the cause of this issue is not known.

OS X 10.7 Lion


Current version for OS X 10.7 Lion: 68.12.0p3 (2021-01-24)
Now featuring support for numerous newer web standards, including Push, Service Workers, Feature Policy, ResizeObserver, Promise Rejection Events, more of the Animations API, and several CSS features. This should improve compatibility with many websites.
For security and privacy reasons, starting in version 68.12.0p3, support for TLS 1.0 and 1.1, HPKP, and the Battery API is disabled.

Firefox download mac os x

OS X 10.6 Snow Leopard

Only Firefox 52 is available for OS X 10.6 Snow Leopard; it will not be updated to a recent version due to technical limitations of the OS.
Note: the program is called 'Nightly' due to licensing restrictions prohibiting the use of the official Firefox branding.


Current version for OS X 10.6 Snow Leopard: 52.9.1p1 (2020-04-11)

Firefox Legacy speaks your language!

Firefox Download Mac Os X

Any of the language packs for the matching official Firefox version are supported.


  • List of language codes (to help you locate the right file to download)
Small areas of the about screen and the help menu that are specific to Firefox Legacy will remain untranslated.

Firefox Download Mac Os X 10.5.8

Known Issues


Download Firefox For Mac Os X 10.6.8

  • Small problems with displaying right-to-left languages on OS X 10.7
  • The crash reporter does not work on OS X 10.7 or 10.8 (it itself crashes)
  • A useless empty share menu is visible on OS X 10.7
  • The sandbox (a security feature intended to protect you from malicious websites) does not work, and has been disabled
  • On OS X 10.7, the browser crashes when the camera or microphone are used
  • WebGL does not work on computers with GPUs not supporting OpenGL 3.0 (many 2006-2007 Macs)
  • Some buttons are invisible on Google Calendar, WordPress, and other sites that use font-based icons
  • DRM (Encrypted Media Extensions/Widevine) does not work
  • Version 68.12.0 only: Screen capture does not work and has been disabled
  • Version 71.0 only: The progress bar is not visible on the icons of downloading files in the Finder