Chrome 70 introduced the picture in picture (PIP) mode for HTML5 video players. This extension simply takes the functionality offered by Chrome and brings it to websites that don't support it directly.
Using this extension you can use PIP on on e.g. these sites:
- Amazon Prime Video
The extension is in an early stage right now. Please feel free to open bug reports in GitHub's issue tracker (https://github.com/mariuskiessling/pipsy).
Disclaimer: This extension is not affiliated and/or endorsed by any of the sites above and in the screenshots.