There are problems with some of the desktop ads now as well. Over the last few days I have noticed several of them trying to install invalid/revoked security certificates on my PC. The certificates are coming from search.spotxchange.com and the ads are so persistent that once they show up it's impossible to do anything except shut down the browser since they continually retry the certificate installation when it is rejected. I wouldn't be surprised if many forum users are now "trusting" this spam source without even knowing it..
I did not realize that malicious ads can try to install security certificates. Is there a way to block this with Waterfox or Firefox? I also now run Ublock Origin to get rid of the ads, because the video ads are so obnoxious, that my browser accumulates 6GB of RAM usage in like an hour, and after 2-3GB, it starts getting sluggish and unresponsive.
ALSO!
I've noticed, on several of my machines, sometimes when I reboot, a bunch of Command Prompt windows popping up and disappearing. There are a few thread in the OS forums, about NV drivers and MS Office Update doing that, but on some of my machines, I only have Intel graphics, and no MS Office installed.
It HAS occurred to me, given the number and frequency of ad-related issues, especially the mobile version, but as you noted, also the desktop version, that this site MAY BE SERVING MALWARE.
The other possibility, is Skype. I leave that running in the background, and it runs Flash Player-based ads constantly. I've caught the Skype client, with an ad, that was trying to push a "Flash Update", and when I woke the machine up, it was sitting at a File Save dialog box.
So, things are afoot, probably malware. I've noticed some strangeness with my Ebay and Paypal accts too.
On all of my main workstations, I don't surf "dangerous" sites, I don't download anything from anything but their official sites. I only really visit AT, Newegg, Ebay, Amazon, SuperBiiz, DistroWatch, and a few others.
Yet, I'm very concerned that they (my machines) were "compromised" somehow.