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A comment on Firefox Release Includes Total Cookie Protection and Multiple Picture-in-Picture. Parent comment
You can change the default in about:config media.videocontrols.picture-in-picture.video-toggle.min-video-secs
I feel like it used to be 30 seconds, although I may be incorrect
You can change the default in about:config media.videocontrols.picture-in-picture.video-toggle.min-video-secs