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Preventing files opened from Mac OS Finder from opening in new windows

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When I open a file from Mac OS Finder in Firefox, the file always opens in a new window. I have `browser.link.open_newwindow.override.external` set to 3. I've also tried setting it to -1, with `browser.link.open_newwindow` set to 3. Is there anything else I should try to get this working?

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