I accidentally had Firefox remember to deny access to let videos go full screen in a particular website. I cannot find where those settings are stored. The accidental selection of having Firefox remember to deny access to let the videos on the page in question to go full screen does seem to be specific to Firefox, since they will go full screen from that page if I use Safari. I tried the solution in the section entitled: "Disable Flash hardware acceleration" on https://support.mozilla.org/en-US/kb/flash-video-wont-play-full-screen which seemed to be the closest to what might be helpful in what I could find by searching Firefox help, but that did not work as I described in my feedback for that page: "I have the latest version of Adobe Flash Player. I went to the page where I cannot get the video to go full screen, but when I hold down "Ctrl" and click on the video I do not see a context menu that includes "Settings" as an option, instead I only see a box that says "About JW Player 6.8.4616 (Premium edition)". I know that I have to change the settings because I accidentally told it to remember to deny access to full screen for videos on this page, but I cannot figure out how to get to the settings and this solution didi not work." If anyone knows how I can go about to get Firefox to once again allow videos to go full screen from this page, I would really appreciate your help. Thanks.