today when I was viewing on to the Gun & Roses discography topic i kept getting this pop up and its not he first time when clicking onto a forum page froma google search i can get similar results. 

http://i66.tinypic.com/2v9p6h3.png

​Clearly spam why would Microsoft give anyone a PS4 

​here is the topic I was on it didn't come up right away it took a fellow moments and its also speaks out the text.

​not got any other issues from websites and I've done a malware scan with Malwarebytes and avest for good measure.

https://adblockplus.org/

Already using that

Well i don't have any adblocker activated on CF and i never encountered any kind of spam page on CF so i would suggest a good clean up of your own PC first.

I've seen the odd weird popup with a another rhythm forum lately, since one of the computers I use has a beta of Firefox Quantum and AdBlock Plus isn't supported yet since it changes the plugin system.

Pc is sparkling clean, bet its something to dowith the ads on the page at the time.

Do you have a download page open such as mediafire? It happens when you have one of these open most of the time.

A couple times I've seen a CustomsForge page I had open redirect to a x0z01i12204.info page with an annoying alarm sound effect and some BS claim about malware or something. I blocked it on my end, but I don't remember seeing it come up in any other circumstance.

This evening, when I was reading a CF thread, it tried to redirect to d2q1.redirect00002.net. This didn't happen at any other website today.

And again today with a URL at j4w.redirect00002.net. Some script or ad/content provider on the site may be misbehaving. I don't see this happen on any other websites I frequent.