So in the interests of investigation i logged into them all, well all that aren’t pop-up and adware managers.
The only one of any significance is meatrolled.com, which is an interesting one. It locks you out, sings round and around at the top of its voice and shows a nice picture of some bird getting it. Ie advertises to all an sundry in your office that you are watching porn. It won’t let you close the window with the normal tabs, and the only option is to give it the 3 finger salute or turn off.
The site solely exists to send your mates to to get them into trouble at work. very funny, but not somewhere you would go unless sent. Unless someone was trying to screw you over.
At a guess I would say, you do indeed have a virus, trojan etc, or have been hijacked.
Best thing to do would be to ask for another computer and to have work ‘test’ yours by going to the sites that you normally visit and see what ‘appears’ as this takes place.
Or they could just be trying to **** you…
Either way you need union/legal advice from outside the company.