Picture-in-Picture (PiP) has become a popular feature for watching videos that do not cover your entire screen. Mozilla Firefox offers PiP as a built-in feature that you can simply click to use. See how.
Why use Picture-in-Picture in Firefox?
If you find yourself posting videos on YouTube or Vimeo while you work, you can cut them to avoid detach the caution. With Picture-in-Picture, you just download the video from the Firefox site. Then move it window where you want it to appear in screen you.
Enable the Picture-in-Picture control in Firefox
Because Picture-in-Picture is built into Firefox's version of desktop, the only setting you need to worry about is whether or not you want to see the video control. This is the Picture-in-Picture power button located above the video on site.
Enabling this button allows you to place almost any video in PiP mode with one click.
To enable the Picture-in-Picture control, open "Firefox" and go to the "Settings" menu.
On a Mac, click the three-line menu button in the upper-right corner of the bar tools and select "Preferences" or Firefox> Preferences from the menu bar.
On both platforms, select "General" on the left and scroll down to the "Browsing" page. Select it frame "Enable Picture-in-Picture Video Controls."
You are ready to use the function!
Source of information: howtogeek.com