Rated 5 out of 5 stars

First of all, thank you for your great work.

I saw that your add-on is now available for Seamonkey 2.2, but it can't be installed because you forgot to modify the install.rdf file.
After modification, I did some tests and your add-on seems to work correctly on Seamonkey 2.4.1.
I had a bug with Lightning 1.0 beta 5, but after the update (Lightning 1.0 beta 7) the problem disappears.

For the next version of Thunderbirthday, please can you modify the install.rdf file by adding this code:
<em:targetApplication>
<Description>
<!-- seamonkey -->
<em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
<em:minVersion>2.2</em:minVersion>
<em:maxVersion>2.4.*</em:maxVersion>
</Description>
</em:targetApplication>

Thanks for all.

This review is for a previous version of the add-on (0.5.0). 

Check out the new version... Compatible with up to Thunderbird 8 and Seamonkey 2.5 :)