I've just discovered how to get a "tab list" in Tab Mix Plus for Firefox! Maybe I missed it before, maybe it's a new(ish) update, but it's the one feature I've longed for most in Firefox, which Opera had but Firefox lacked (apart from Opera's lightning speed - though recently the speed differential between the two browsers has reduced, Firefox 3 is much faster and Opera 9.5 opens more slowly than their previous versions, though I think Opera still has the edge on speed).
Turn on the tabs list option and you'll find that, just like with Opera, you can view a list of all your current tabs easily just by holding down the Ctrl key and tapping the Tab key - keep tapping and releasing Tab to cycle through the tabs, and release both keys when you get to the one you want. For a keyboard fan like me it's much, much faster and easier than any other way to view all my open tabs at once and then get to the one I want quickly. So much better for productivity.
To enable the option, just tick "Ctrl-Tab displays a tab list popup menu" in the Tab Features tab of Tab Mix Plus's options (get to the options either through the Firefox Tools, Add-ons menu - click on the extension in the list and click Options - or direct in Tools, Tab Mix Plus Options).
I'd add that, for me, the single most essential Firefox add-on or extension is Tab Mix Plus. If you don't have it already, it's free and you can install it easily (how to install a Firefox extension - for another add-on called Greasemonkey, but the steps are the same): install Tab Mix Plus.
I just thought I'd blog this productivity tip as I might not be the only person who's missed this fab feature.