Sum up:
RoboForm was developed by SiberSystem
RoboForm.mxaddon was upload to Extension Center by Roman Gravit
Roman Gravit used email @siber.com, so he probably worked there (and his Facebook profile confirm this)
It means that RoboForm for Maxthon is probably official add-on
They both responded to messages: RoboForm - via Twitter, Roman - via Facebook.
So they know about situation and probably they will connect with Maxthon Team.
But maybe I could give them links to someone from Maxthon Team on Facebook or Twitter (Lizzie or Jeff)?
P.S.
By the way, the website works, but you shoud use siber.com/index instead of siber.com