Rated 5 out of 5 stars

Very nice, thanks!
Would be possible to implement this (https://bugzilla.mozilla.org/show_bug.cgi?id=1518025) feature request in this addon?

Meaning, for selected accounts, hitting reply to a mail to
user+facebook@domain.org
would also default to the identity
user+facebook@domain.org
?

This review is for a previous version of the add-on (1.9.7).