Rated 5 out of 5 stars
Excellent add-on! I have one request, though, to make it perfect for my use:For the filter, include "LABEL" on the if-field.Since I use labels in Thunderbird, with a gmail imap account, this would be SUPER-AWESOME, as it would make labels in TB sync with labels in Gmail (by filtering and moving labeled mails to the folders that gmail interprets as labels). Please consider adding this in an update - I´d happily donate to make this happen.
If you also added a functionality for adding labels, we´d get at working 2-way sync between gmail labels and TB labels.