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There is an annoying little message poping-up on the bottom-right corner of the screen, just above taskbar, near the hour. It appears each time one selects a message in thunderbird and change its label color priority (0 important, 1 work, 2 personal, 3 to do, 4 wait).

It say's "quick filters applies filters on the selected message".

This is a new and, sorry, seemingly boring and inconvenient feature.

Please, wouldn't it be possible to remove it ? That would be nice and great, at least to my undestanding, and from my point of view.

Это отзыв для предыдущей версии этого дополнения (3.4). 

it can be by xnote++, 4 other users reported it at http://quickfilters.mozdev.org/bugs.html

I fixed it yesterday and the fixed version is here:
https://www.mozdev.org/bugs/show_bug.cgi?id=26457#c5
(all detail there) I will releasee 3.4.1 with the fix he coming weekend.