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Updated Firefox, won't run on my OS. How do I go back to old version.

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dog_star
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I just updated Firefox to latest version and cannot run it on my current OS. How can I get back to the older version I was using until I'm able to upgrade my OS? As it stands I cannot access Firefox on my Mac. The icon has a big do not enter cross on it. Please help. Fast. Thanks.

I just updated Firefox to latest version and cannot run it on my current OS. How can I get back to the older version I was using until I'm able to upgrade my OS? As it stands I cannot access Firefox on my Mac. The icon has a big do not enter cross on it. Please help. Fast. Thanks.

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FredMcD
FredMcD
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https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release

Firefox 78 is the last supported version for Mac OS X 10.9, 10.10 and 10.11. Users will be moved to Firefox Extended Support Release (ESR).


Note: With some versions of Firefox, the data files are not backward compatible. If there is an issue, create a new profile and we can tell you how to recover the data.

Step one: How do you completely turn off update checks in Firefox v64? You can use a policies.json file to disable updates for all users. https://github.com/mozilla/policy-templates/blob/master/README.md or https://winaero.com/blog/disable-updates-firefox-63-above/

You can use a policies.json file in the distribution folder in the Firefox installation folder instead as also listed in the article, so no need to use GPO keys in the Windows Registry. • https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ You can use the ManualAppUpdateOnly policy in Firefox 87+ to enable only manual updates e.g. via "Help -> About Firefox".

Note that it is important to stay up to date and install the latest security patches.

FredMcD
FredMcD
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Step two: Note: With some versions of Firefox, the data files are not backward compatible. If there is an issue, create a new profile and we can tell you how to recover the data.

Install Older Version Of Firefox {web link} Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

Note: If you know what version you want, press <Control> (Mac=<Command>) F to open the search bar. Then enter the version number to see the available files.


You should also check out Firefox; Extended Support Release {web link} ESR Notes System Requirements