Downgrading to 2.0.5 brought back the FTP accounts Rated 5 out of 5 stars
Found and installed the good old 2.0.5 and that brought back my FTP accounts. Looking forward to the fix.
Sorry for the bug in the first place. It is fixed in the next version (2.0.7) which can be found here: https://addons.mozilla.org/en-US/firefox/addon/fireftp/versions/
(until it is officially reviewed by the Mozilla add-on team)
I appreciate your patience and understanding with the bug - sorry again for the inconvenience.