List of 50 best Firefox extensions
One thing that catches my eye is that some of the extensions, like ScrapBook, make me say "hey, browsers should do that on their own already." The extensions are also categorized which helps with finding stuff you're actually interested in. A lot of the extensions are not hosted at Mozilla's site and/or seem pretty unique, such as the Gmail Delete Button, which (you guessed it) adds an actual delete button to Gmail's interface. Definitely worth a look.