I have 3 tabs open named 1, 2 and 3. If I close tab 2, Firefox will automatically show tab 3. How do I get Firefox to show tab 1 instead of tab 3? Basically, move to the left instead of the right? I searched about:config using words like: tab, open, close, next, left and right and compared the results on http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries to get a good idea of what each entry did. Learned a lot and reconfigured other aspects of Firefox in the process! But, I would really like to alter the way Firefox processes tab closures. Thank you.