So you want that tab scrolling is enabled but doesn't work? - @leocg
I want "Enable tab scrolling when many tabs are open" to be turned on.
When turned on there are at least 4 ways to scroll:
I can't stand method 1. and I think the most straightforward way would be to disable/hide/remove the scroll bar above the tabs (and thus method 2. as well) but I want to keep method 3. and 4. intact