I was informed that the TB extension didn't work properly with TB 45. The fix looks easy, so I made a fix release (0.17.1) available here for testing:
https://www.thregr.org/~wavexx/tmp/thunderbird-filelink-dl.xpi I'd be happy if you could give it some testing, especially for older versions of TB (<38) that I no longer have at hand. Thanks!
