Go back to an old version of Firefox - m…
http://kb.mozillazine.org/Go_back_to_an_old_version_of_Firefox
To downgrade to an old version of Firefox, back up your Firefox profile first, as a precaution, and then follow these steps: Back up your Firefox profile as a precaution. Download the version you want from http://download.cdn.mozilla.net/pub/firefox/releases/ or http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/. 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). Exit Firefox and then uninstall it. Install the old version of Firefox. Stable, Beta and Extended Support Release (ESR) Versions http://archive.mozilla.org/pub/firefox/releases/ https://ftp.mozilla.org/pub/firefox/releases/ ...
Back up your Firefox profile as a precaution.
Download the version you want from http://download.cdn.mozilla.net/pub/firefox/releases/ or http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/. 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).
Exit Firefox and then uninstall it.
Install the old version of Firefox.
Stable, Beta and Extended Support Release (ESR) Versions http://archive.mozilla.org/pub/firefox/releases/ https://ftp.mozilla.org/pub/firefox/releases/ ...
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