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You can try Vertical Tabs in Firefox now
(www.ghacks.net)
A place to discuss the news and latest developments on the open-source browser Firefox
If you have lots of tabs up top you can't see the names, vertical tabs lets you see more/all of the tab titles.
I have been using the tree style tabs add-on for years, it's amazing for a tab hoarder.
Nice, that's a good point! I didn't think of that.