picture in picture wont turn off

Are you sure that this is a PiP window and not a floating media player that some websites like YouTube offer ? A picture in picture window is opened by clicking the blue PiP button that appears if you hover the player. Doesn't the "Ctrl + Shift + ]" keyboard shortcut work as well ? ---- You can look at these prefs on the the <b>about:config</b> page to see what settings work for you to block autoplay. *media.autoplay.default = 5 [0:allow;1:blockAudible;2:Prompt;5:blockAll] *media.autoplay.blocking_policy = 2 *media.autoplay.allow-extension-background-pages = false *media.autoplay.block-event.enabled = true You can open the <b>about:config</b> page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue. *https://support.mozilla.org/en-US/kb/about-config-editor-firefox *https://support.mozilla.org/en-US/kb/block-autoplay