[Tracking Requested - why for this release]: This is an unfortunate visual glitch where we'll show the "Picture-in-Picture" toggle for a split second when videos are still in the midst of loading. This is probably exacerbated on slower connections where it takes longer to load the video.
Bug 1545924 Comment 4 Edit History
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[Tracking Requested - why for this release]: This is an unfortunate visual glitch where we'll show the "Picture-in-Picture" toggle for a split second when videos are still in the midst of loading, even when the PiP feature is disabled.. This is probably exacerbated on slower connections where it takes longer to load the video.