To add something to @zenzen 's Comment:
Dod You use Thunderbird as Flatpak? And Firefox as Flatpak, too? I ask for the last one because Zorin has made a Change for Zorin 17.1. They changed to Firefox .deb in the ISO:
Hi everyone!
We wanted to give you a heads-up that we're currently uploading a newly revised set of Zorin OS 17.1 .iso files with the -r2 label. You'll be able to download them from our website soon after our official download mirror servers have completed syncing the .iso files, most likely within the next 24 hours.
This is a minor revision of Zorin OS 17.1 which includes the following changes out of the box:
The latest software updates and security patches are pre-installed.
Newer hardware…
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