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Works like a charm! (pre.: Reply-all broken) Rated 5 out of 5 stars
The extension isn't broken after all. It appeared to be an other extension which makes reply-all behave incorrectly... Granted this on the 5 stars it deserves...
I've been a users of this plugin for a long time and would have rated it 5 stars (sorry for not effectively doing that). But as of version 13 of Thunderbird (running on Ubuntu), reply-all is broken...
Could you please try "restore default set" and then add the reply all button again. I am not sure but this might be some upgrade related problem.