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https://www.mozilla.org/en-US/firefox/features/picture-in-picture/ https://www.mozilla.org/en-US/firefox/features/picture-in-pi... https://old.reddit.com/r/PleX/comments/mr1k8m/just_discovered_the_picture_in_picture_mode_in/ https://old.reddit.com/r/PleX/comments/mr1k8m/just_discovere... https://news.ycombinator.com/item?id=43121881 https://news.ycombinator.com/item?id=43121881