I have found a solution. I removed
~/snap/thunderbird/common/.thunderbird/8sbugc0d.default/handlers.json
and restarted Thunderbird. The links are now working.
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Public bug reported:
I just upgraded to Ubuntu 24.04. Selecting a link in an email no longer
opens the link in Firefox. I ensured that Firefox is my default browser,
and I set network.protocol-handler.app.http and network.protocol-
handler.app.https to true.
I am using Thunderbird version 115.11.
