Firefox, PHP Headers and application/octet-stream

We have a page that outputs a file using PHP headers, so when you visit the page the download prompts up.

Randomly, the page will return a file application/octet-stream, other times it will return the correct thing.

It works prefectly in Chrome, IE, etc.

This only happens in Firefox and it is completely random开发者_如何学Python.

Basically, it outputs as a application/octet-stream instead of the correct one.

After some more digging, I found the following:

http://support.mozilla.com/en-US/questions/800957

http://support.mozilla.com/en-US/questions/746116

http://support.mozilla.com/en-US/questions/699834