Rated 4 out of 5 stars

Didn't realise code snippets weren't to be posted, and they were stripped from my last post. Basically, look for the maxVersion sections in the extension's install.rdf file, and change them to match the version of the application you are using. If you add .* (i.e. for Thunderbird 3.1, write it as 3.1.*) to the end, you shouldn't have to edit the extinction file again when minor updates are released.

This review is for a previous version of the add-on (2.1.1).