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Fullscreen mode don't work
I've noticed that fullscreen mode don't work in my Firefox (54.0.1, x64). Checked it on some sites and nothing. I've tried to reinstall Norton and it don't help also. Youtube, VK.com, gidonline.club - fullscreen mode don't work on these sites, but maybe it don't work with all sites in Firefox. Version of my NS - 188.8.131.52.