Rated 4 out of 5 stars

I hope I am understanding gloops problem right, but if you set spam filter to dump the bad mail into other than inbox folder and set inbox folder alert only using this, then you should be able to avoid getting spam alerts.
That's what I did exactly and I am happy as clams!
No more false alarms. Well it does change the icon of T-bird which says there is msg, but that's default behavior. I do not get a pop up box or sound. That's good enough for me.

HOWEVER, this may be a real bug. When I click on the alert, a new instance of TB pops up. So, if I hit multiple times, I get multiple inst of TB. I am also using MinimizeToTray and having multiple TBs there could be annonying. May be you intended this way, but...
Still extremely useful++++ only a star off for that.

This review is for a previous version of the add-on (0.13.1).