Same here. And although I may stick with it due to my loathing of the alternatives, I'm increasingly sick of it. The complaints about the new URL bar/bookmarks toolbar were exactly my experience, but what's worse is Mozilla just doesn't care[0].
They also have a mobile browser called Firefox Lite which after a recent update displayed sponsored ads as top sites on the home screen.
Not a problem though, just remove them and put your own chosen sites, right? Wrong. It's not possible.
Repeat: Mozilla forces unremovable advertising as top sites on the home screen of one of their mobile browsers, used by millions of people.
On the download page for this product[1] Mozilla modestly promotes itself as:
"dedicated to keeping the power of the internet in people's hands"
[0] https://news.ycombinator.com/item?id=22832729
[1] https://play.google.com/store/apps/details?id=org.mozilla.ro...
Since 60/Quantum, I can't think of a single UX change which hasn't been detrimental. Someone up top is souring the entire product in a misguided attempt to recapture market share. But all they're doing is continuing to bleed out remaining users, the majority of whom are likely somewhere between the casual and power user.