PriusChat is Choking my Chrome Browser

I use the Chrome browser for my Chromebook and MacBook Air.
Both run an up to date OS.

For the past week or so, if I open PriusChat I start to hear some audio advert that usually stutters, my notebook starts to heat up, the fan turns on and it slows to a crawl. Only a reboot helps.

Presumably some misbehaving advert. I lost patience today and installed Adblock. So far no more problems, and the website works long enough to post this thread ;-)

I had turned off Adblock as a courtesy to the owners of PriusChat but the site is SO much better without the crud I've decided to keep it on and send off a contribution instead.

 

I'll post the seekret after Danny replies.