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How to stop YouTube videos from sometimes going fullscreen instead of playing.

When I try to watch a video on YouTube with subtitles it goes fullscreen when it starts playing. This also happens with the video preview. Is this a Firefox bug or YouTub… (lue lisää)

When I try to watch a video on YouTube with subtitles it goes fullscreen when it starts playing. This also happens with the video preview. Is this a Firefox bug or YouTube forcing me to use their app?

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