Hey there!

Yes, you can install the previous version of FF. Please check out the link to find out how:

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

Just beware of the fact that older Firefox versions pose a significant security risk. Other than that you're ready to go!

Hope I helped!

Kind regards,

Bithiah

What about the rest of your profile? Settings, bookmarks, history, passwords . . . .

Look on your desktop. Do you see a folder called; Old Firefox? Look inside. Look for the folder with the latest creation date.

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update