Rogue Tech. Tip #1 - Firefox Tab History

Firefox: Changing number of recently closed tabs

Couldn't find anything on this so I gave it a shot myself.

I'm using Firefox 2.0.0.12

1. Type about:config into the address window.
2. Scroll down to browser.sessionstore.max_tabs_undo.
3. Double click and change the number to the amount of tabs you'd like to recall.

Click 'OK' and you're done. You may want to bookmark this because you can customize a lot of other things from this page too.

I don't know what the max. number is but, I just keep it at 20-30 which is plenty.