How to enable Click to Play in Firefox:
This will not allow plugins like flash to run unless the user allows them to run. This also keeps those phantom videos from starting when you visit a site.
You are asked if you want to activate Adobe flash plugin and once you OK it, the video will play. This adds an extra click each time but I like the fact that these plugins will not play until they are allowed to. This may be a pain in the rear for some. Adobe flash is an example. There are other plugins that are affected by this.
Open Firefox and type “about:config” (without quotes) into the address bar.
Look for, “plugins.click_to_play” (without quotes) and set the value to true.
See attachment for results of this. This is after clicking on a youtube video.