Link Safe

Every time you switch to full-screen mode in YouTube (or indeed any other website) while watching a video in Firefox, a message appears stating: “YouTube.com is now fullscreen. Press Esc at any time to exit.” If this gets on your nerves, there’s a way that you can disable it. Type about:config into the browser’s address bar, click ‘I’ll be careful, I promise!’ and type: fullscreen-api.approval-required into the search box. When you see the preference ‘full-screen-api.approvalrequired’, double-click it to set it to False. Now, when you want to watch something in full-screen mode, the browser won’t ask for your approval.