Steps to disable Picture-in-Picture video control in Firefox
1. If you see the icon to the right of your screen, as below, when launching a module. This means Picture-in-Picture is enabled in Firefox and needs to be disabled, for the module to work correctly.
2. To override for this browser window, right-click the displayed Picture-in-picture icon and choose Hide Picture-in-Picture Toggle
3. To disable it entirely from Firefox, click the top right Menu icon ( also known as a hamburger icon, top right of page, below X)
4. Click Options
5. Scroll down to the Browsing section, deselect the Enable picture-in-picture video controls