Hi Tzuzeku,
Thanks for your report. PHP wise all data is properly sanitized and checking comments I don't see any issues there.
Unfortunately it must be a bad ad in the rotation.
Can you please click on this
link and attach or pm me the html? It will list all the ads you viewed while on our site and hopefully lead me to the bad one. Also can you let me know what page you are being redirected to if possible?
Edit: I've had the addon comments page open on 5 different popular AddOns with ads for 20min and so far I haven't been redirected.