FYI, there are
reports that fanfiction.net is having an ongoing security issue.
The report is that someone has gotten malicious javascript into the site that can modify your profile in various ways if you are logged in. Possibly even from just doing mouse-over on certain elements.
I don't know how to log out of the site without going there, so I'm just not visiting it for a while.
To the best of my knowledge, using FanFicFare cannot trigger this malicious code because FFF cannot run any javascript from site pages.