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PDF is always downloaded

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A PDF file is always instantly downloaded to my downloads directory, without asking anything. I've set it to this behaviour at some point, long long ago. Now I want Firefox to use its built-in viewer, but I can't get it to work.

See the attached image for how it's set in the options panel.

I'm a bit confused as to why there's both "Portable document Format (PDF)" and "PDF file". The latter one does NOT have an option "Preview in Firefox". So I've set that one to "Always Ask", but even that won't work. It seems whatever I set these two to, makes absolutely no difference to how Firefox behaves when I click a link to a PDF.

Attached screenshots

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You can try to rename/remove handlers.json and delete mimeTypes.rdf when present in the Firefox profile folder with Firefox closed to reset all file actions. You can alternatively edit handlers.json if you are comfortable with editing files in JSON format and remove the two PDF sections.

I see these:

"application/pdf":{"action":3,"extensions":["pdf"]}
"application/force-download":{"action":0,"ask":true,"extensions":["pdf"]}

Helpful?

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