If you are suffering, like I was suffering, with this bullshit ass new age tab layout they rolled out, in the middle of a Solar eclipse I guess by pure coincidence, I got you.
Type about:config in your address bar and press enter
Say “yes let me pass”
Type browser.proton.enabled in the search bar
It will show ‘true’ on the right hand side
Double click it
It will turn to ‘false’
Happy birthday, stay safe