There are a lot of pretty useful Firefox extensions, but none equal that of Tab Mix Plus. It is less “how much it does” (although it does a ton) and more that it provides four critical features that vastly improve my browser experience.
Multiple Rows of Tabs
I hate scrolling tabs. Who wants to scroll to get to a tab? I also hate shrinking tabs because it kills the often overlooked “locality” factor in user interaction. Let’s face it, I’m a hater. But Tab Mix Plus fixes all this hating by providing a setting which keeps tabs fixed width and just uses multiple rows of tabs. Done and done.

Duplicate Tab
There are lots of times where I want to duplicate a tab, history and all. Right mouse on the tab, and presto, duplicated tab. Double delicious.
Undo Close Tab
How many times have you closed a tab, and thought, “Dammit, I didn’t want to do that.” Tab Mix Plus gives you the ability to undo this action, or even select from a list of recently closed tabs. (Note to use this feature you have to add it to the menu via the Tab Mix Plus settings.) Very nice.
Open Links in Tabs
Now lets say you are looking at a page with a list of links.

You want to review this list of pages. Instead of having to click on every link, you simply select the text containing the links, right mouse, and select “open in tabs.” Smooth like butter.
There is a lot of love in this extension, but these four features make it for me. I highly recommend it.

You rule Scott. This is the missing link in my tab setup.
:D
Shea
Awesome recommendation, thanks.