On the tests I performed on Version 8.1, Feather 1.3.320.0 (with Foundation Page template) on Chrome and Firefox it seems works fine.
Can you provide more information about the issue in order to reproduce and inspect it:
- Versions user (Sitefinity and Feather (incl. package used as template)
- Any display/advanced settings
- If there are any customization on the widget
- The type of the video, and if this is reproduced with different video types
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