How can I STOP Thunderbird for OSX from being default mailer?
I'm migrating back to Mail from a bad T'bird experience, but the "default email reader" in Mail /prefs/general keeps flipping back to Thunderbird each time I set it to "Mail". And I can't see a way to remove it from the selection w/o uninstalling T'bird. Not ready to do that yet, and should be able to have both launchable with Mail as default.
T'bird prefs/help says a lot about MAKING T'bird the default but nothing about stopping it from launching.
Any help ?
MacBook Pro 15″, OS X 10.11