General purpose :
- undoclosetab is a frustration saver ! (you can get back closed tab in one click)
- Greasemonkey custom scripts (password reminders
- flashblock (Thanks grigouze!) : replace all flash objects by a play button. You play only the one you want : It was a god send when firebird (yes I think it's that old) was not playing nicely with flash on linux.
Web developement:
- webdeveloper toolbar (of course). And I explicitely add the “Cookies” Menu in the bar
- livehttpheaders