I like to use the Ctrl or Alt + Number shorcut to jump quickly to a specific tab. Problem is: When you have a lot of tabs open it is hard to look at them and quickly know which one is tab number 7.

Is there a way (extension possibly) to show a tab's number in its title?
This way each tab would have a number added to its title right beside the favicon. This way you could immediately tell which number you need to press to jump to a specific tab.

I use both Chromium and Firefox, so I'm accepting answers for either one (though I'd prefer both =) ).