Let's see, I use:
Adblock Plus
Noscript
Rinkaichan (translates Kanji by mousing-over, indispensable when I browse japanese pages)
GTranslate (adds an option to use Google Translator in the contextual menu, great because it auto-recognizes the language)
Fast Video Download (I only turn it on when I need to download videos)
And a Calculator addon that sits in the status bar opens with a click, stupid but more effective than opening Wincalc every time
Thanks for suggesting AutoPage and IE Tab, will try them now








