I was also disappointed with how slow Firefox was on Linux compared to Windows.I got Firefox back to smooth on Linux by installing Liquorix kernel and switching from x11 to wayland
There is also a Chameleon addonIt allows you to change the user agent for individual sites without changing the global one
I remember how I had Firefox, which also used vertical tabs, hiding the address bar when there is no cursor on it, the minus is that because of this, the entire center of the sites will be shifted
I check Cinebench and Passmark Cinebench Wine - 4112 pointsWindows - 3874 pointsPassmarkWine - 7053 pointsWindows - 6864 pointsLinux - 7145 points It looks like the problem is in cpu-z and not in wine or linux
I was also disappointed with how slow Firefox was on Linux compared to Windows.
I got Firefox back to smooth on Linux by installing Liquorix kernel and switching from x11 to wayland