Rated 4 out of 5 stars

Works with firefox fine and shows in Thunderbird a notification when a mail arrives in inbox and stays there. There is no notification when mails are filtered and send after receiving to a folder in local folders. When configuring the filter to start after Junk-detection gnotifier shows a notification but without content. Seems the filter-Engine takes the message before gnotifier can get it.
system is Linux Mint cinnamon 18.1 64-bit, TB 45.7.0, gnotifier 1.9.8

This review is for a previous version of the add-on (1.9.8).