Rated 3 out of 5 stars

Used to be very useful, BUT doesn't work on Thunderbird 3.1 - according to the install.rdf file only up to Thunderbird 3.0b1 is supported.

This review is for a previous version of the add-on (0.5). 

The extension still works in Thunderbird 3.1. The max version from install.rdf is overruled by the version specified on addons.mozilla.org, which is 3.2a1pre at the moment...