With Flash being the dominating force on the web for video streaming back when YouTube got its start on the Internet and then changing the code a decade later in order to leverage the latest standard in streaming technology, it left somewhat of a niche problem with the Flash code continuing to work just fine, assuming Adobe Flash was still installed in the browser, however if it’s not, the user is presented with a nasty “plugin is missing” error message on their screen. With Firefox lacking native Flash integration and plugins rapidly becoming a thing of the past, Mozilla had to act, and they did, click here to see how.