Just tested in a clean and fully up-to-date focal VM, and this works as
expected: by default PDF files are opened in the built-in pdfjs viewer,
but when I change the setting to use the system's default application,
they are opened in evince.

Can you run the following command in a terminal and attach the file
whose name gets printed?

    find ~/.mozilla/firefox -name handlers.json

** Changed in: firefox (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1908049

Title:
  Firefox cannot open pdf with viewer (evince)

Status in firefox package in Ubuntu:
  Incomplete

Bug description:
  
  Description: Ubuntu 20.04.1 LTS
  Release:     20.04
  Package:     firefox 83.0+build2-0ubuntu0.20.04.1
  firefox:
    Installiert:           83.0+build2-0ubuntu0.20.04.1
    Installationskandidat: 83.0+build2-0ubuntu0.20.04.1
    Versionstabelle:
   *** 83.0+build2-0ubuntu0.20.04.1 500
          500 http://at.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       75.0+build3-0ubuntu1 500
          500 http://at.archive.ubuntu.com/ubuntu focal/main amd64 Packages

  Expecting:
  Changing the Firefox PDF setting from "Open in Firefox" to "Use system 
default application" leads to opening pdf resources with evince.

  What happend instead:
  pdf resources are opend inside firefox with internal viewer

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