#1 Tab Mix Plus - enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager. Current official version is not compatible with FF3, but you can download 0.3.7pre version from the developers forum. One of this add-on advantages is the ability to Export\Import settings. Here are mine. You can save it as a *.txt file and then Import.
#2 Adblock Plus - Every time I use others' computers, I wonder how do people suffer such a huge quantity of annoying advertising. Install this add-on and you will forget about any kind of adv.
#3 Easy DragToGo - Allows you to open links in new tabs, search texts, save images and do more with drag and drop gestures easier.Works perfect in association with Tab Mix Plus.
#4 FireFTP - a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers. You can have a multiple accounts, and change them easily.
#5 Greasemonkey - Allows you to customize the way a webpage displays using small bits of JavaScript. You can find lot of useful scripts on http://userscripts.org/
There are some more, but they are no so useful. May be I'll add them next time.
