As of January 2019 Google released their own extension for same exact purpose so I recommend switching to it https://chrome.google.com/webstore/detail/picture-in-picture-extens/hkgfoiooedgoejojocmhlaklaeopbecg/
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Picture in picture mode can be forced with this extension even if website doesn't support it.
Ways to use extension
Click the extension icon whenever any kind of video is present on the current page.
* Right click on the video and click "Force picture in picture mode"
* `Alt + shift + s` on Windows or `Cmd+Shift+S`on Mac whenever video is present on the page
* Click PiPPY icon which is embedded in supported players(current only Twitch.tv)
Extension uses icons which are provided by https://icons8.com
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!
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