The error message "Firefox is installing components needed to play audio and video on this page" pops up in yellow on Hulu and it occurred after I updated Firefox to the latest version(47.0). It's been days now and the message is still there despite restarting my computer and refreshing Firefox. Hulu's audio and video have been fine this whole time, but am having the occasional graphics issue with Firefox and my Macbook. My tabs disappear and only when I click on them, do they reappear as shown on the first image where part of the display is missing and/or has an odd design as seen on the second image. The menu bar at top of my Macbook's display was mirrored, and vibrating, on top of the dock at the bottom of the display. I couldn't see the icons and only when I clicked on them, did I see the text describing what they are. That last issue has disappeared, but the ones in the browser keep popping up unexpectedly. My software, add-ons, and extensions are all up to date.