As the title says. I get this prompt on videos from different, yet particular websites and sources. And they fail to load. It's also happened where some video's work and some don't, side-by-side on the same website and session. * I've tried clearing all of my cached data, my browser history, cookies, site-data, settings, and fill-out information. No avail. * I've tried disabling all of my extensions and add-ons. * I've even tried using google instead, but I just get constant loading on those particular video's with no thumbnail (As depicted in second picture). * I've checked my video drivers for updates. * I've tried reinstalling Adobe Flash Player, even though it says it's no longer supported. Since it also might be happening in another browser. I understand how this might not be Firefox's fault. But I'm hoping you'll be able to help me still.