The ads are only an issue on mobile, I sometimes check forums from bed (bad habit) before I go to sleep and last night I actually had an ad that tried to activate the mic. I have a Blackberry DTEK50 which has some extra security features such as asking for permission if an app tries to use a resource, so I got a popup asking if I can allow Firefox to use the mic. I'm like "uhhh no?" and denied it.
This one is amusing too:
I like that it's smart enough to know what city I live in but not smart enough to know we don't have a casino here. At least they are showing real Canadian 20's, so I'll give them that.