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You can disable autoplay in Firefox by setting the following about:config prefs:

  media.autoplay.enabled = false
  media.autoplay.enabled.user-gestures-needed = true
This feature is not currently enabled because it can confuse some websites' video players. They can get stuck in a bad state because their JavaScript assumes the video is playing, but because Firefox didn't autoplay it the player buttons don't work correctly.

I hate these decisions by Firefox where they don't enable something because it would be inconvenient for websites! They should enable it and websites should fix their broken players.

Then their naive users would abandon them en masse because Facebook and YouTube won't work right. The thing to hate is that useful settings like this aren't in a more readily accessible preferences dialog for the rank and file to discover. You have to be told it's there or go spelunking through about:config.

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