I've just updated to version 12 FF. Now FF does not open how do I get back to my old version.

How to uninstall this upgrade. The old version was 3.6.something (I can't open FF to see). The upgrade will not work with this OS.

1. download a copy of the Firefox program the link above jscher2000 gave us in his response

2. Trash , install the current application of Firefox to do a cleaning.

3. install the version you downloaded (3.6.28).

Do not select to delete your personal data, your profile data is stored in the Firefox profile folder, so you will not lose your bookmarks or other personal data.

See also: Installation of Firefox on Mac

Remember 3.6.28 this is not supported over (this is the last for your 10.4.11 mac)

Thank you

Tags: Firefox

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