Videos at PBS do not load

http://video.pbs.org/video/2365184276/

For this and all videos I've tried at PBS.org, the video will not load, instead providing an error message "Error loading plugin: plugin file not found"

Disabling HTTPS Everywhere results in desired playback of video. I could not find a PBS site setting in the extension

HTTP-E 3.4.5 Firefox 27.0.1 Mac

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