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I'm trying to make Flatpak Libreoffice the default app for opening files in Thunderbird.

At the moment, Thunderbird (also a flatpak) is using System Handler as default. I tried changing it but cannot find where the libreoffice executable is on my system.

I found the libreoffice .desktop files in /var/lib/flatpak/exports/share/applications but Thunderbird doesn't seem to recognise the app?

To Do
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    Possible duplicate of Where to find application after flatpak installation (gimp) – K7AAY Oct 22 '19 at 16:40
  • How to change the program which opens attachments in Thunderbird is explained here That combined with https://askubuntu.com/questions/1051438/where-to-find-application-after-flatpak-installation-gimp should be sufficient to get you where you are trying to go. – Elder Geek Oct 23 '19 at 01:53
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    I knew about the Thunderbird attachment settings, but when you choose "other" it makes you choose an executable file whereas flatpaks are run with a flatpak run app which cannot be chosen through the Thunderbird settings. I guess one possible solution would be to write a bash script to run the flatpak command. However since there is a .desktop file that runs the programme why isn't Thunderbird offering that as an option of apps like the Desktop Evironment? I tried pointing TB to the LO .desktop file to no avail. – To Do Oct 23 '19 at 06:38

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You were very close. I had the same problem. I want to use Microsoft Edge to open links in Thunderbird.

In thunderbird 102.10.0(64 bit) I went to Edit -> Settings and scrolled down to Files & Attachments.

For Content Type https I selected action Use Other and then selected /var/lib/flatpak/exports/bin/com.microsoft.Edge

and now Microsoft Edge is invoked when I click on a link in Thunderbird.

Don
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