Those preferences were never intended to be permanent. I wasn’t a big fan of the redesign but as a nightly user have been using it for quite some time now and it doesn’t bother me now. I think you should stop fighting it and really give it a try (at least 2 weeks) to really get used to it and see if there’s still pain points that impact your workflow. If after your 2 weeks, you still have issue then please share your feedback here, your ideas for new features on https://ideas.mozilla.org or any bugs on https://bugzilla.org.
Sidenote: If you miss the compact mode, you can enable it back in
about:config. You will need to set
1. I also made a userChrome theme that slim down even further the UI https://github.com/dannycolin/fx-compact-mode. Keep in mind that those two solution aren’t officially supported but there’s no plan to remove those prefs anytime soon.
Hope it’ll help you to appreciate a bit more the new design!
Could you explain why you can’t use the current Firefox? Without specifics on what is preventing you from using Firefox it is impossible for the developers to make changes to make it possible for you to use it and impossible for someone to suggest how Firefox could be customized so you can use it.
If you have strong feelings about needing to change the toolbar layout, you have the option to make your own modifications with a userChrome.css file. I have a site to get you started, and the community on r/FirefoxCSS can help, too: