LibreWolf is very privacy focused and hardened by default in ways that impact convenience. Waterfox on the other hand? I'd say switching to that is easier than turning off all the shit you'd have to turn off in a fresh FF install. You copy the profile folder into the spot where WF stores its profiles, and you're done. All your everything is intact. History, cache, bookmarks, cookies, extensions, login sessions, settings (though your opt-out settings for garbage like homepage sponsored links or AI don't do anything anymore because there's nothing to opt out of).

I'd been using Firefox since it was Netscape Navigator. One toggle too many got me on Waterfox a few months ago. I have noticed absolutely no difference in my heavily customized browsing experience from the change, other than not having to go menu diving to turn off the new data harvesting anti-feature of the month.

Yes, "essentially firefox but without mozilla corporation or data harvesting / ad partners" is exactly what you'd want to use instead of firefox. Waterfox in particular is so "essentially" firefox that it is firefox. Copy over your profile folder. Click the blue icon instead of the orange one. Congratulations, you are migrated and never have to worry about sponsors or ai in your browser again. Waterfox doesn't even have telemetry to opt out of.