This has happened more than once now with different adverts so I presume its intentional. but its only occasionally so I dont worry about it much.
Ads
Yes I do have firefox with adblock+ installed but it is far slower than google chrome so i use google chome instead. I dont know whether its the adblock slowing firefox down or whether google chromes just a better browser than Firefox.

I have also these ads. Its clearly something with chess.com, i have never heard any ads with sound before, and will not install any ad blockers etc.
Its clearly totally unaccetpable. A lot of people in the forum writes its chess.coms intention annoy as much as possible to make people buy a membership... (must the most stupid marketing strategy in the history of marketing in that case).
Now complete with sound effects.
This is the first time I've seen an ad with sound on chess.com. Is this a intentional or should I report it?