When I opened Firefox today, it updated itself to a version that I no longer recognize and I hate it so far. I'd like to revert to the previous version that is familiar to me. How to do this?

Modest success: I tried refresh, and it worked to a degree, not totally the same but similar.
https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Edit: After some fairly extensive effort, I think I've got it back to where it was. Hope it sticks. :clap: