Bugzilla

STRs (might crash your browser):
- check that autoplay is either on "block audio" or "block audio and video" 
- open https://store.google.com/product/pixel_6a
- wait for the page to load

The page will initially open but remain in a loading state with a lot of blank areas. It seems the page is spamming the autoplay, which leads to huge memory consumption. Eventually depending on your hardware, the page will either load or the browser will stop.

Profile of a few seconds of this: https://share.firefox.dev/3AmHcn6

Emilio on Elements mentioned: 
> There seems to be multiple things to fix there, probably. Tons of time in the child just logging to the console for example, but also probably we should dispatch the GloballyAutoplayBlocked event once per document, or at least check that the permission is not already blocked here before dispatching the event: https://share.firefox.dev/3JWf25o

STRs (might crash your browser):
- check that autoplay is either on "block audio" or "block audio and video" 
- open https://store.google.com/product/pixel_6a
- wait for the page to load

The page will initially open but remain in a loading state with a lot of blank areas. It seems the page is spamming the autoplay, which leads to huge memory consumption. Eventually depending on your hardware, the page will either load or the browser will stop.

Profile of a few seconds of this: https://share.firefox.dev/3AmHcn6

Emilio on Elements mentioned: 
> There seems to be multiple things to fix there, probably. Tons of time in the child just logging to the console for example, but also probably we should dispatch the GloballyAutoplayBlocked event once per document, or at least check that the permission is not already blocked [here](https://searchfox.org/mozilla-central/rev/497076b5edd0f906ae088cdf224e45896162694b/browser/modules/SitePermissions.jsm#810-812) before dispatching the event: https://share.firefox.dev/3JWf25o