Here’s a great Firefox extension that helps find the tab you’re looking for among dozens. Tab Filter/Tab Search, developed by Tito, adds an option to Firefox tabs’ context menu so you can filter in the ones that match by title, address or both the terms you entered. As you start typing, tabs that don’t match the criteria are removed until you get the wanted ones.
To get all your tabs back, just press Esc or close the filter bar.
It works really great. My only complaint is that Tab Filter/Tab Search desperately needs a keyboard shortcut to activate the filter bar. (And a shorter name!)