How do I change which app Firefox uses to open PDFs?
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.
Additional System Details
Quite a few, but the problem still happens with all add-ons disabled.
- User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0
This is Ubuntu, but I think this askUbuntu page might help