I've been trying to get a video to play for over a day now, drm-controlled content is checked but firefox won't install the widevine plugin, it just keeps saying that it will install shortly. I even deleted the cache in hopes to fix the problem, but it did nothing. What can I do to fix this? Also, and I don't know if this is a related problem, some websites just don't show up. It will say they are loaded but all I get is a blank screen (dailymotion and instagram so far).