your updated Addon is not working for me. Thunderbirds console shows me the following
NS_ERROR_FILE_NOT_FOUND: Component returned failure code: 0x80520012 (NS_ERROR_FILE_NOT_FOUND) [nsIZipReader.open] - trayservice.jsm:75
I thing this happens, because i have a space in my user folder.
for example:
C:\Users\John Doe\AppData\Roaming\Thunderbird
I think, this causes the error.
It would be gread, if you could fix it in your next release.
SeppiW: https://github.com/nmaier/mintrayr/issues/188#issuecomment-422183744