Torbutton is a 1-click way for iceweasel/firefox users to enable or disable the browser's use of tor (an anynomous communication system).

torbutton tries to isolate as much as possible tor sessions from your non-tor sessions to preserve your anonimity. to achieve the safest possible browsing experience, various browsing features are also reconfigured in tor sessions (like javascript, cookies and plugins).

it adds a panel to the statusbar that says "tor enabled" (in green) or "tor disabled" (in red). the user may click on the panel to toggle the status. if the user (or some other extension) changes the settings, the change is automatically reflected in the statusbar.