[html] HTML embed autoplay="false", but still plays automatically

None of the video settings posted above worked in modern browsers I tested (like Firefox) using the embed or object elements in HTML5. For video or audio elements they did stop autoplay. For embed and object they did not.

I tested this using the embed and object elements using several different media types as well as HTML attributes (like autostart and autoplay). These videos always played regardless of any combination of settings in several browsers. Again, this was not an issue using the newer HTML5 video or audio elements, just when using embed and object.

It turns out the new browser settings for video "autoplay" have changed. Firefox will now ignore the autoplay attributes on these tags and play videos anyway unless you explicitly set to "block audio and video" autoplay in your browser settings.

To do this in Firefox I have posted the settings below:

  1. Open up your Firefox Browser, click the menu button, and select "Options"
  2. Select the "Privacy & Security" panel and scroll down to the "Permissions" section
  3. Find "Autoplay" and click the "Settings" button. In the dropdown change it to block audio and video. The default is just audio.

Your videos will NOT autoplay now when displaying videos in web pages using object or embed elements.