When holding Cmd, show tab numbers on tabs to aid Cmd + {tab number}
shortcut.
Why? It is difficult to eyeball the number of tabs, resulting in the shortcut being largely useless for tabs past ~#5.
Here is a mock-up:
Pinned tabs are too small to fit a number but those are the first tabs and thus the ones easiest to determine the number of, so I think it is fine to not number them anyways.
This could have a toggle in preferences.