Firefox appending .xls extension to .xlsx files

Posted by Chris Lively on Super User See other posts from Super User or by Chris Lively
Published on 2010-12-29T23:47:51Z Indexed on 2010/12/29 23:56 UTC
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firefox

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file-extension

We are serving files with the .xlsx (excel 2007/2010) extension. IE, Chrome, Safari all download the file and open excel just fine.

Firefox is being stupid. For some reason it's appending .xls to the extension. I found this: https://support.mozilla.com/bs/questions/758363

However, the instructions weren't very specific and completely unclear to me.

How can I tell Firefox not to screw with the file extension?

Thanks,

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