How to disable opening pdf in firefox browser (viewer)
Since the latest update on Aug. 12th 2021 (version 91), I am unable to open pdf links in my native program. I have the "Use Windows default application" selected in the drop down; however no matter which selection I choose the Firefox web browser will not open pdf files in it's native application installed on the computer. Instead it opens up in a new tab every time. I am now reduced to using Microsoft IE to open these links so it works using my native application.
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You are not alone. It may be a bug. https://support.mozilla.org/en-US/questions/1346989
There is a bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1725921
Thank you for your reply. Hopefully they fix it soon!
-Cory
It seems the issue is caused by a deliberate change in Firefox 91 which is unlikely to be undone. I have dealt with the problem by disabling Firefox as a pdf viewer. Change the following preference in about:config to true: pdfjs.disabled.
https://support.mozilla.org/en-US/questions/1347907#answer-1436949