In vertical tab mode, it is not practical to show the full name of tabs all the time, so most people shrink that bar to a size that shows the favicons and maybe a bit of the names of those tabs.
However, in the occasional case when you do need to see the names of tabs, it is hard to find them because we can't see the whole tab's name.
So, can it be made so that hovering on the vertical tab bar makes the bar a little bit wider so that we can read the names of most tabs? Kinda similar to the sidebar you have on orionfeedback.org.
My usual tab width:
Roughly how far I would like it to expand:
(Maybe) if you hover on a tab: (quick mock-up made using preview, sorry for low quality)