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How do I change which app Firefox uses to open PDFs?

Posted

In my settings I have Firefox set to open PDFs using the app 'okular' (see screenshot). In my file browser, PDFs open in 'Okular' (see screenshot). However, when I click a pdf in the Firefox downloads pane, it opens with 'GNU Image Manipulation Program'. Why is this, and how can I change it to 'Okular'?

I'm running latest version of Kubuntu, with current updates.

In my settings I have Firefox set to open PDFs using the app 'okular' (see screenshot). In my file browser, PDFs open in 'Okular' (see screenshot). However, when I click a pdf in the Firefox downloads pane, it opens with 'GNU Image Manipulation Program'. Why is this, and how can I change it to 'Okular'? I'm running latest version of Kubuntu, with current updates.
Attached screenshots
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Additional System Details

Installed Plug-ins

Quite a few, but the problem still happens with all add-ons disabled.

Application

  • User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0

More Information

user1321319 4 solutions 59 answers

This is Ubuntu, but I think this askUbuntu page might help

This is Ubuntu, but I think this [https://askubuntu.com/questions/204823/how-do-you-change-the-default-document-viewer-to-okular askUbuntu page] might help
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