That.. Needs to be at a much higher resolution. But browsers have a server they check now, see if a site is bad. Could be that The Escapist is registering as such.
You could have some malware on your machine, *nix isn't an excuse not to.
Without sounding preachy, *nix is just as vulnerable as Windows to getting malware, possibly even more so since most *nix users are elitist retards like Mac users. I've seen drive by downloads alternate what they send to the PC based on a small script determining the OS so they could get Apple, Windows and major *nix distro's. Majority of Windows bugs I come across aren't actually Windows, they're programs like Adobe PDF reader, Firefox, etc. Nothing in the Windows source itself. Granted, you still get the odd buffer overun or fuzzing attack, but I've yet to see anything immune to those.
But all that aside, if your computer hasn't changed (Which isn't guaranteed, you had to be online to get that message) then it's more than likely the browser getting a (hopefully) false positive.