DOM Inspector - Mac OS X Requires Restart
Inspect the DOM of HTML, XUL, and XML pages, including the mail...
Colorify Unread Watched NNTP Requires Restart
Colorizes names of newsgroups that have watched threads with unread messages.
notto Requires Restart
Do not send mail to the addresses found into notTo field.
Set your Facebook, Twitter etc. status by selecting a text on any page.
PassToScript extension Requires Restart
Extension to pass e-mail in eml (raw) format directly to the script specified
No Close Other Tabs Requires Restart
Removes "Close other tabs" context menu item.
This addon adds some Android Debug Bridge access to Firefox. It requires access to the adb/adb.exe executable from the Android SDK.
Makes the application to the default client on every startup.