my favourites firefox extensions are:
|| Name || Url || Description ||
|| Adblock || http://adblock.mozdev.org/ || Remove ads before they got displayed ||
|| Customize Google || http://googlebar.mozdev.org/ || personalize google page and remove ads ||
|| Tab Mix Plus || http://tmp.garyr.net/ || Personalize tab behaviour and save session when exiting or after a crash ||
|| Faster Fox || http://fasterfox.mozdev.org || Tweak network setting trying to speed up web browsing ||
|| Sage || http://sage.mozdev.org/ || A feed reader with customizable css ||

kysucix