Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

What are the exact interactions necessary for an autoplay permission of "default (block audio)" to permit autoplayed audio?

  • 1 reply
  • 1 has this problem
  • 7 views
  • Last reply by cor-el

thefishface+ff
thefishface+ff
more options

If you don't touch the autoplay permissions for a site, Firefox seems to be attempting to use some heuristics to decide whether autoplay, such as calling ".play()" on an Audio object in javascript, should be allowed. What are these heuristics, and where are they authoritatively documented? [https://developer.mozilla.org/en-US/d.../Autoplay_guide#autoplay_availability|MDN] has some information but nothing Firefox-specific.

If you don't touch the autoplay permissions for a site, Firefox seems to be attempting to use some heuristics to decide whether autoplay, such as calling ".play()" on an Audio object in javascript, should be allowed. What are these heuristics, and where are they authoritatively documented? [[https://developer.mozilla.org/en-US/docs/Web/Media/Autoplay_guide#autoplay_availability|MDN]] has some information but nothing Firefox-specific.

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

See these AutoplayPolicy files in the source code: