Yes, I am a bit suspicious too. But, I can say that with more tests it seems that Xsoft simply does not work, or works very little, with regard to Firefox, thus explaining that perception of mine. It does work, in its limited--fast--way with IE malware. It certainly is not a complete malware detection program though!
Sure, probably no program is wholly complete, but I do think that Xsoft is structured to pick out certain malware--just for profit.
In any case, I agree that there is some credibility problem. Although sale "puffing" is legal (I'm a legal research analyst), this Xoft statement is untrue:
"Xoftspyse v.4.31 is the latest and most advanced spyware detection and removal application on the internet."
This cannot be true, in itself, being it detects no FF collected malware, and certainly does not detect all the malware that (e.g.) Spybot does.
In its truly limited role, it is fast for more common malware, and does pick up some extra malwre once in a while, but just (mostly) when one is using IE.
So to all you potential users out there, please be aware that Xoft is NOT a complete solution, but is handy for many common malwares, and IS FAST.
Thanks for your alert, tech!
Appreciated, Diligent.