User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 Steps to reproduce: I tried to choose Firefox as my default program to open PDF files by these three ways: - First, through the window Properties of a test PDF file, in the "Open with" option. - Second, through the Windows Configuration in Apps > Default Apps > Choose default apps by file type. - Third, through the File Explorer, clicking in the test PDF file, choosing in Home > Open, through the "Open" menu (by clicking on the arrow on the right), "Choose another app". There I chose Firefox and check the box "Always use this app to open .pdf files". Actual results: I could not be able to choose Firefox as my default PDF reader. To make sure that it was not a problem of my PC, I formatted it via Windows Configuration > Update & Security > Recovery > Reset this PC > Remove everything > Just remove my files. I could also check after formatting I could choose as my default PDF reader program other software such as Acrobat Reader DC and Microsoft Edge. Expected results: I had to have been able to choose Firefox as my default PDF reader.
I could verify that I am not the only one with this problem when I saw this post on Reddit, https://www.reddit.com/r/firefox/comments/9ug7mc/cant_set_default_pdf_viewer_to_firefox_in_windows/. If you need more information about my system I am available.
dupe of bug 787674 ?
Component: Untriaged → PDF Viewer
(In reply to Matthias Versen [:Matti] from comment #2) > dupe of bug 787674 ? I do not think so because I can choose Firefox as the program to open my PDFs (when I use the "Open with" option in the contextual menu of the file). If I can do that I do not see the reason why I could not choose it as my default PDF reader.
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