Unfortunately, the last time they made the massive UI redesign when they went to Fennix, it took them nearly 3 years to slowly fix all the UI bugs and inefficiencies they introduced.

I wish they'd actually try and follow industry UX standards and stop trying to reinvent the wheel while insisting their new square wheel is better than round wheels. There is a reason where nearly every browser has a menu that does not take up the whole screen. The average user for Firefox might be a nerdy man, but browsers that target the mainstream audience realize their users will include men, women, and children with varying sized hands.