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Awesome Throbber
Firefox extension that allows you to attach URLs to your mouse clicks...
Throbber Button
A Firefox add-on that allows you to click on the Activity Indicator...
Firefox extension activity extension indicator activity indicator
Rotor Throbber
A Firefox add-on that replaces your default throbber with a spinning rotor without changing your current theme....
Firefox extension spin replacer replace throbber spinning rotor
Throbber Changer
A Firefox add-on that changes the default throbber to a user customizable one...
MoveThrobber for SeaMonkey
A SeaMonkey add-on that allows you to move SeaMonkey throbber from the toolbar to the menubar...
customize menubar SeaMonkey extension throbber customize menubar