New mail icons doen not appears for movemail

[Myppomeu]

Debian 8 x64, KDE 4, Thunderbird 38.5.1 x64, Firetray 0.5.7pre1 and 0.6.0. I did not tried previous versions.
For Unix Mailspool (Movemail) accounts (they are getting mail from /var/mail/username file) does not appears new mail icon. There is no black checkmark against "movemail" string in Firetray settings.

P.S. I know very sad news thats project is discontinued. But maybe someone will continue development of this awesome addon (Thunderbird is unuseful without it in my opinion).