3 ms·

Sorry but you got the wrong setting here. To disable autoplay it's media.autoplay.enabled

• noselasd 9y ago
  media.autoplay.enabled toggles whether videos in the current (foreground) tab starts auto playing or not The question was about videos in a background tab, which is controlled by the media.block-autoplay-until-in-foreground setting.
  • JoshTriplett 9y ago
    Unfortunately, neither of those settings does quite what I'd like. Once a tab has been in the foreground, I'd like it to continue being able to play things in the background, including new things. (For instance, some sites play a chime for notifications.) I just don't want anything played from a tab that has never been in the foreground.
  • bigbugbag 9y ago
    Sadly mozilla provides no documentation for those settings, but I can assure you that this setting does not care if the tab is in the foreground or background, autoplay is simply disabled which it seems to me was what was asked here IIANM.