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Failure entering full-screen when playing video

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Using Windows 10 with Firefox to launch Canvas LMS. Using Canvas LMS web page that has an embedded video lecture. I can start the lecture and play it in the embedded webpage but when trying to go to full-screen mode, the full screen flashes open and then Firfox immediately returns to the webpage and restarts the embedded video?

Attempting the same sequence on Chrome works fine and the video plays in full screen mode. Whats wrong with Firefox? Is there a setting to fix this?

Using Windows 10 with Firefox to launch Canvas LMS. Using Canvas LMS web page that has an embedded video lecture. I can start the lecture and play it in the embedded webpage but when trying to go to full-screen mode, the full screen flashes open and then Firfox immediately returns to the webpage and restarts the embedded video? Attempting the same sequence on Chrome works fine and the video plays in full screen mode. Whats wrong with Firefox? Is there a setting to fix this?

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Since this is a login site no one else others then the users can verify the problem or no problem. So you need to check with the site doing the lecture about the playback issue with Firefox.