Just to throw my two cents in, I did not have the problem described but I was absent from this site for a couple of months for technical reasons. Whenever I tried to post during that time, an ad would appear in the text box. This also happened on the WW2talk site. I have Bitdefender and usually use Firefox. I ran Bitdefender frequently, and for some reason the problem just upped and went went away about 2 weeks ago. I suppose Bitdefender finally caught and destroyed it. As you can probably tell I am a technical ignoramus.
LOL you have two ads on this very page , most sites, including probably Otto, "sell" some screen space to advertisers to meet the bill, the problem with that business model is the web master loses a lot of control over his own page as there is an amazing amount of "redirects" and the ads are "served" by some computer he knows little or nothing about. most of the time the worst the ads do is .... try to push more ads or install some tracking cookie to better profile the user for targetted advertising, so are rather benign and they will not attempt to spread to other computers on the network. The behavior I described is in a grey legal zone, as the user clicked on the original link it's assumed he "requested" all the rest of the garbage, attempting to infect some other computer would be clearly illegal in some jurisditions and would land the advertiser in hot water.
I cannot speak for other sites, but no adverts here should auto-download anything. All the ads here go through Google and google alone, and they do not do anything of that sort. I would never use an ad service that did anything like that.
I run Chrome and Firefox. FF is good for not seeing the ads on Youtube. I also run my mail apps in it, extra security against malicious scripts. I use Chrome because I like it.
I'd like Chrome so much more if it weren't such a memory hog. Am unbelievable 4 gig to run it at an optimum sort of usage level, which I'm quite capable of allowing but despite it making phone/desktop syncing so easy, I just object to it's virus-like seizure of resources. Current Firefox is back to its old 'light' ways, so it's still my favourite. To be fair, Edge does seem very light on it's toes too, but when the only thing it brings to the table is that weird ability to draw on the screen it's all a bit meh still.
The ads round here do indeed look pretty well behaved (for ads ), but I do not trust ads (and things like the facebook "icon") on principle, but I admit that I'm a bit of an extremist here as I come from a work culture where were all professional paranoids, we even leave phones out of the door during confidential meetings,.
If you saw how easy they were to co-op, you might do the same. It's not a matter of whether they are able to hack the camera, it's a matter of whether someone decides to pick your machine.