I'm experiencing those as well and it's sometimes only with firefox when before it was almost always chrome. You could try taking a screenshot ( a full one so Raz can see the time ) and then sending it his way to he could track it down(?)
Some people use adblock or something to that nature and it works for them. But ja, those ads can be a bit tedious.
Well again, you can try messaging Raz about the issue because it might've been overlooked if it's not important.
I don't have any issues when it comes to the pop ups, they don't make me choose and answer or whatever before I'm allowed to 'x' out like what you're describing, nor does it have me sit there for 5 minutes before I'm allowed to do anything else. Are you sure you don't have anything already on your computer that could be virus related or something?