Why does my PDF download instead of opening in Firefox?
Question
Why does my pdf download instead of open for viewing in Firefox?
Answer
Here’s how to troubleshoot some problems in the new Firefox PDF reader: https://support.mozilla.org/en-US/kb/view-pdf-files-firefox-without-downloading-them#w_using-a-pdf-reader-plugin
The section of the help article that opens will show you how to change the settings to use Adobe Acrobat or Reader instead of the built-in PDF reader.