Why firefox 33 do not open any films (FLV or WMV)

Not one link to a film with the extension FLV or WMV works
I cleaned my cache I reinstalled VLC but the older versions firefox 2.1.3 keeps coming up. I installed again windows movie plug in what not is showing up in the list.
I reinstalled firefox and still no movies only a big list of characters on my screen.
It looks like firefox don't like movies :-)

See http://kb.mozillazine.org/Page_displays_as_gibberish
The problem is that your web server is using "text/plain" instead of the correct MIME type (content-type), which would be '''video/x-flv''' for [http://www.file-extensions.org/flv-file-extension .flv files] and '''video/x-ms-wmv''' for [http://www.file-extensions.org/wmv-file-extension .wmv files].
Contact the service provider or webmaster for your website and refer them to this thread or to https://developer.mozilla.org/en-US/docs/Web/Security/Securing_your_site/Configuring_server_MIME_types
I'll mark the answer by cor-el as solving this question, since he figured that '' the server is sending the file as text/html or text/plain.''

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Why firefox 33 do not open any films (FLV or WMV)

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