Firefox in Kubuntu is broken, as it doesn't follow the system default applications that I can configure using "file associations" in the KDE Control Module. For example, it wants to open folders with K4dirstat, videos in itself and PDF files with GIMP.
I want Firefox to download everything (or almost everything) by default, and then when I double click the downloaded file in Firefox I want it do open using xdg-open (or using the application
xdg-open would use), including "open the containing folder" thing.
My question is similar to this question from 2011: Firefox: open downloaded files with system default application
But I want "save file" marked in that window, and later open with a sane application from within Firefox.
This unanswered question also seems related, as if it is possible to do what I want. I think that other question is answered too: https://askubuntu.com/questions/546113/change-default-application-for-a-file-type-in-dolphin-and-firefox