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Do not want firefox to choose wrong program as default to open a file

  • 5 replies
  • 5 have this problem
  • Last reply by cor-el

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Lets say I open a downloaded text file. Firefox defaults to open with notepad. That is correct, but I want to open it in WordPad instead. I work with that file then delete it and move on. Sometime later I want to open a downloaded microsoft Excel file. However, Mozilla defaults the program used to open the file, to WordPad, the last selection I made. Microsoft should have seen that this is an Excel file (has a .xls or .xlsx extension) and automatically defaulted to download with Excel.

Is there an option change that will force the desired behavior?

Thanks Ed Barker

All Replies (5)

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It is the MIME type that determines the action and not the file extension, so if both files were send with the same MIME type then Firefox will use the same action.

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So then, how do I determine what the MIME type is for a certain file type, and how do I force the MIME type to associate to the correct program?

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If there is a MIME type specified then Firefox asks what to do.
If you previously ticked the box to do this automatically then you need to find the MIME type in Tools > Options > Applications and change the action there.


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When I attempt to open a file FF asks me what program to use to open it. But the checkbox to always use this program is ghosted. Is there a way to get this to stick?



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That happens if the file isn't send by the server with a MIME type that is registered and that Firefox recognizes.

See Unable to set an automatic action: