A small selection have just started coming up whenever my browser is inactive for a certain period of time.

If the pages are opening for no known reason then you may have got a malware. Run a malware scan like Malwarebytes and also an antivirus.

Did you read through my entire post -_-?

I use Kapersky anti-virus now after a long stint with Norton and a shorter stint with norton. I used to use adaware but that also dropped off in effectiveness. I'll try Malwarebytes and adwCleaner.

At this point I'm just trying to block certain sites from coming up. A small selection have just started coming up whenever my browser is inactive for a certain period of time. I've deleted cookies, temp files, ran anti-virus and malware scans. Still come up after a short period of inactivity. So I'm just going to block the websites altogether. So I think I'd just like to block them in Opera, since it's the only browser I currently use.

That aside though I think taking out the ability to block websites altogether is a somewhat terrible idea, even if you can still do it through extensions.

Could you recommend a few? or anyone who reads this? For me this is a problem I'm ready to uninstall Opera over.

I've been using Opera for several years now and I've always liked the way the browser works. However, after recently updating to the 33.0 version I no longer see a way to block websites specifically. Is this still possible?