Firefox is automatically downloading PDFs even though I've set PDFs to "Ask whether to open or save files", and I choose to open in the browser. My settings are set to: Applications - all are set to always ask or open in Firefox What should Firefox do with other files? I selected: Ask whether to open or save files When I'm opening a PDF I get a popup What should Firefox do with this file and I choose open with Firefox, it still saves to my desktop. What do I do to stop it from downloading?