Google Chrome and Chromium-based Vivaldi and Opera already support Picture in Picture mode where the user will be allowed to view a video on top of other windows in a mini window. Since new Microsoft Edge powered by Chromium now available is in version 75, it also supports PiP and you don’t need to enable any flag for it to work.
Picture in Picture mode in Microsoft Chromium Edge
1. Launch new Microsoft Edge browser
2. Visit YouTube
3. Play any video, right click on video two times and select “Picture in Picture”
4. You’ll see the video playing in PIP mode with back to tab option in new Edge browser
Apparently, there are related flags –Enable Picture in Picture and Enable the use of SurfaceLayer objects for Videos – for PiP in edge://flags which you don’t need to think about much, but you need to enable them if Picture in Picture doesn’t work in Edge browser.
At present, Mozilla is also working to bring Picture in Picture mode to the Firefox browser, you can test it in Nightly version.