>>25679I don't update very often, so this change happened multiple versions ago and they already removed any about:config options for disabling it. This time they added a non-removable addon overflow button to the taskbar, that mimics the one already in chrome. Apparently it *needs* to be there for some Manifest V3 functionality to work. The only way to get rid of it is setting the ui element sizes to 0.
Chrome is even worse though. I can't even disable any of their shit, ever and imagine putting a NEW sign in the right click menu.