Videos, like mp4 Vines, won't play in Firefox. Same with the media files like podcasts in rss feeds. All used to work fine. This is an intermittent problem with Firefox ( might be due to updates ) but it doesn't happen with IE or Chrome

If i uninstall VLC player or disable the VLC plugin, nothing happens If i have those installed but the VLC plugin is set to " Never activate ", i can right click on the video image, click " Play " and it opens in VLC player and works perfectly. If i have the plugin set to " always activate " then i see a black square and the message " the video can't be played because the file is corrupt "

Windows 8.1, Firefox 35.

This is an issue with Firefox and needs to be resolved.

Please help.
Thanks!

I didn't find the right solution from the Internet.

References https://support.mozilla.org/en-US/questions/1042962

Business Whiteboard Animation video