Rated 5 out of 5 stars
This add-on is indispensable for everyone whose inbox is overflown with spam messages and need Thunderbird junk control to really work.
By using the "Is spam", "Is good" button in the special "Uncertain" folder you train the Bayesian filter with both types of message, which improves the filter efficiency significantly.
Moreover, the add-on allows you to see the probability of message being junk, where does the junk status come from (manual, filter...), ability to set the junk threshold and more.
I no longer check my junk folder and all messages with 98% and higher probability of being spam are automatically deleted - it is that good!