Firefox Legacy

Firefox Legacy is an unofficial modified version of Mozilla Firefox that works on Mac OS X 10.6 Snow Leopard.

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

As of 2021-10-24, Firefox Legacy is no longer supported. It has become increasingly challenging to update it to a more modern Firefox version, and I no longer use it myself.
There will be no further updates to Firefox Legacy.

For an up-to-date browser for older Macs, try Chromium Legacy. You may need to open this direct link in Firefox Legacy to download Chromium Updater; no other browser for OS X 10.7-10.8 is able to display GitHub correctly. When opened, Chromium Updater will appear as an icon on the right side of the menu bar. Click it, then select a stable version of Chromium Legacy to download. Once the new copy of Chromium Legacy is downloaded, drag it to the Applications folder. You can keep Chromium Updater and use it to update the installed copy of Chromium Legacy.
To enable Google sync in Chromium Legacy, quit the browser, then enter the following command in Terminal (it is one long line):

open -a /Applications/Chromium.app --args "--oauth2-client-id=77185425430.apps.googleusercontent.com --oauth2-client-secret=OTJgUOQcT7lO7GsGZq2G4IlT"

Chromium Legacy will open; log into your Google account. You will not need to run the command again unless you log out.

OS X 10.7 Lion and 10.8 Mountain Lion

Firefox Legacy for OS X 10.7 Lion and 10.8 Mountain Lion is no longer available for download because it offers no advantages over Chromium Legacy.

If you only need to use Firefox Legacy as a stepping stone to download a newer browser, the 10.6 version will work on 10.7 and 10.8.

OS X 10.6 Snow Leopard

Only Firefox 52.9.1 is available for OS X 10.6 Snow Leopard; it will receive no further updates, in part 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.

Download

Source Code

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

Firefox Legacy speaks your language!

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

• Language packs for version 52
• 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.

Known Issues

• The sandbox (a security feature intended to protect you from malicious websites) does not work, and has been disabled
• 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