If I click a url in a Thunderbird email I then get a "Launch Application" GUI with "This link needs to be opened with an application. Send to:"
with a "Choose" button on a line with "Choose other application"
I assume I should look to link to a .desktop file in /usr/share/applications/ or a local .desktop file but the "Choose" file dialogue doesn't seem to show hidden folders or files?
What can I do?