Today, in Youtube (YT) i clicked the fullscreen button and a prompt came up to make full screen the default in YT. I declined and now the full screen button in you tube no longer works. I did not know that no matter which choice I made it would make permanant changes to YT functionality regarding video sizes. Small screen no longer works either and my only choise is Theater Mode. How to I change the setting back to having a choice in video size for any video on YT? I have spent the last two hours checking every option to c hange this back and it appears this is something new as no one seems to have had this particular problem. The solutions for seting changes I have found online do not work. Unless this was a change in Firefox my browser.
Help and Frustrated