ClearSearch is not needed anymore for Thunderbird 0.9 and newer! If you enter
some text in the search bar, a "clear" button will automatically appear inside the search bar:
This extension adds back the "Clear" button for the search bar in the mail main window of Thunderbird 0.8. The current version is 1.0, you can download it from here.
Last updated 2004-09-19 by Patrick Brunschwig <patrick DOT brunschwig AT gmx DOT net>