Rated 5 out of 5 stars

per madboy74 el set. 11, 2017 ·

It's a great addon, but the new Firefox versions can't use it. Please update it!

This review is for a previous version of the add-on (1.11.0). 

per mkiol (desenvolupador) a nov. 17, 2017 ·

I've decided to continue development only focusing on Thunderbird.

Unfortunately due to few constrains (see https://github.com/mkiol/GNotifier/issues/162) it is not possible to "fix" it to be compatible with the newest FF release.