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I really want to switch back but... honestly: Chromium Edge, despite a few annoying features being shoved in your face, is actually a really nice browser IMO. It's definitely going to take some time to get used to FF again.
I'm so used to things like vertical tabs, icon only bookmarks, etc... I know I can change a lot in FF myself, but having to add custom css and whatnot on every device I use FF on is just annoying.
Firefox Sync should keep all your settings and extensions synced for each install
I had custom css in FF and Firefox sync did not sync those manual edits.
There are tons of extensions for tab management for Firefox. If vertkcal tabs is just that they're arranged in lines instead of columns, I've used Tree Style Tab and Sidebery, and there are many others.
Use the sidebery add-on, along with a vertical Firefox CSS theme = problem solved.