[uncbob]

Mine updated automatically today and now I am all screwed up
How can I go back to the previous version

[goldstategop]

Just install FF ESR 52.05 or the equivalent in Cyberfox and you can keep using legacy FF extensions through next summer.

[Elderberry]

Mine updated automatically today and now I am all screwed up How can I go back to the previous version

https://support.mozilla.org/en-US/kb/install-older-version-of-firefox

[oh8eleven]

https://ftp.mozilla.org/pub/firefox/releases/

[hsmomx3]

I had the previous version in my programs file. Or you can just go to the FF site to download it all over again. The bookmarks, etc. stay intact.

[minnesota_bound]

#6 Older versions.
Backup the bookmarks Ctrl + Shift + B
Import and Backup> Backup and save to your desktop.
If Firefox did not import then you can manually by clicking on Restore> Choose File and browse to the desktop file.

Uninstall the new version and install the older version.
All your extensions may or may not show up.
http://mozilla_firefox.en.downloadastro.com/old_versions/