On Youtube in safari, you can right click twice to get the PIP option.
However, I can't figure it out for amazon instant video
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Does Amazon support PIP in Safari? I've never seen any options to use it. Do you have any info from Amazon that this is supported? – fsb Mar 19 '17 at 22:10
I don't have access to Amazon Video, so I can't test this, but try out PiPifier (Mac App Store link). It installs a Safari extension that takes any HTML 5 video and puts it in a PiP window. You can read more about PiPifier on GitHub.
answered Jun 23 '17 at 19:21
