Linux&Win, it's JavaScript code, add-on runs fine on any OS under FF or TB. Rated 3 out of 5 stars

Linux version? Thunderbird is available on Linux, the add-ons are coded in JavaScript and thus the only reason to create plugin limited to group of systems, or just one, is if the add-on needs to access something OS specific.
Which would make me very careful, after asking why on earth it needs to do something OS dependant, then I'd forget the plugin *unless* I had *really* strong urge to have what it claims to offer, after which I would check the source code and/or (in any order) test it on FireFox W32 version on wine tracing it's file and other accesses, but I'm an amateur on that last way.

This user has 2 previous reviews of this add-on.