Just to make sure you're aware, there's the Firefox View feature which lists Open and Recently Closed tabs, sorted by parent window, with a search box for filtering. Navigate this page with mouse or keyboard (Tab and arrow keys). It also lists History by date or domain.

There's also the List All Tabs feature, which has been available a long time. Either or both of these can be added to your toolbar from the Customize Toolbar page.

I guess anything more sophisticated could be done via add-ons.

Is there a browser you feel does a better job of tab switching?