Embedded videos resizing oddly in Mozilla Firefox

I seem to be having fatal errors whichever way I turn trying to get video into Storyline reliably.

Moving on from inserting video into the project, I'm now trying embedding as a web object, and in Firefox it insists on resizing the video so that it is oversized, then cropping it down. The video is cropped to the correct dimensions albeit with the outsides missing, and when  you hover over it, it expands to its full size.

 Does anybody know if this can be fixed?

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