CA Renter, thanks for the heads up. There is no code on this site that accesses cameras or mics. (We just double checked this now to make sure there was nothing new. BTW to Ribbles — it was a good guess though!).
If it truly came through the site, my best guess is that it somehow came through a Google ad. The other possibility is that it didn’t actually come from the site… maybe it’s just a glitch, but it could possibly be the result of your computer being compromised. So just to rule that last possibility out, I’d definitely recommend thoroughly scanning your system for malware if you aren’t already doing that.
As for the Google ads, they will be going away soon, so if that was the cause, it will cease to be an issue soon enough.