Firefox display odd characters when I click an mp4 link

Up until about a month ago, I could click a link to an mp4 file and it would stream in my browser perfectly - now, I get square characters and question marks - just a bunch of giberish. These videos play perfectly in Safari, Chrome and IE.
I'm on FF 31.0 and the browser reports that Firefox is up to date. What changed with the recent updates?

This happens if the server sends the file as text/html or as text/plain.
In such a case Firefox will try to render the page instead of opening it in a media player.
This can also happen if you ever got the "Open with" dialog when you clicked such a link and have chosen to open file in Firefox.
You should never do this to avoid such an issue and you will have to remove this action in Firefox > Preferences > Applications
*http://kb.mozillazine.org/File_types_and_download_actions
If that wasn't possible then rename (or delete) the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.
*http://kb.mozillazine.org/mimeTypes.rdf
*http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions

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