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(4) Click the toolbar button again to open the menu, then "Add/Edit Content Types (View Log)" (3) Trigger the download (you can cancel after you get the dialog)
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Here's how you would set that up for these files: If a change like that doesn't come quickly enough, would you consider using an add-on for this? I have an extension called Content-Type Fixer that checks the file extensions of downloads and lets you override the Content-Type. Does the forum have a place to raise this issue? Perhaps the site could be persuaded to reconfigure their web serving software. I suspect this is because the server is not sending a Content-Type header with the file (according to the first attached screenshot, from Firefox's Browser Console): It appears Firefox is peeking at the start of the file, which is
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