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Firefox keeps downloading pdfs as TextEdit files (macOS Catalina)

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Firefox thinks the default application for viewing pdfs should be mac's TextEdit (which just produces jumbled garbage). I can manually change the application when the download window appears, but how do you change the default for future downloads? I can download the pdfs correctly from Safari and they open in my pdf viewer (Preview).

Firefox thinks the default application for viewing pdfs should be mac's TextEdit (which just produces jumbled garbage). I can manually change the application when the download window appears, but how do you change the default for future downloads? I can download the pdfs correctly from Safari and they open in my pdf viewer (Preview).
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Did you check the Portable Document Format (PDF) setting in Options/Preferences ?