Aardvark: https://addons.mozilla.org/en-US/firefox/addon/4111

Delicious bookmarks: https://addons.mozilla.org/en-US/firefox/addon/3615

Distrust: https://addons.mozilla.org/en-US/firefox/addon/1559

Download Statusbar: https://addons.mozilla.org/nl/firefox/addon/26

Downloadhelper: https://addons.mozilla.org/nl/firefox/addon/3006

Foxyproxy: https://addons.mozilla.org/en-US/firefox/addon/2464

Html validator: https://addons.mozilla.org/nl/firefox/addon/249

Multiple tab handler: https://addons.mozilla.org/nl/firefox/addon/4838

Remove it permanently: https://addons.mozilla.org/nl/firefox/addon/521

Resizeable textarea: https://addons.mozilla.org/en-US/firefox/addon/3818

Stumbleupon: https://addons.mozilla.org/en-US/firefox/addon/138

Web developer: https://addons.mozilla.org/nl/firefox/addon/60