Primary Password (was Master Password) to block access to Thunderbird UI

[GwydionBowydd]

My copy of Thunderbird is protected by a Master password, which ensures that you enter your password before Thunderbird launches.   However if you "CANCEL" at that point and do not enter your password Thunderbird STILL launches and existing e-mails can still be read.  If you try and send an e-mail the password will be required, but existing e-mails can still be read without entering the password.  This seems bizarre.
It would be better if Thunderbird doesn't launch at all if you press "CANCEL" at the password stage.  Thank you

[moz_samri]

Moz has a problem in that Master PW and Passphrase are used in multiple contexts.

In FFox, the Passphrase is use to access SYNC storage.

In TBird, the phrase seems to be the concept of preventing read/write of the messages.

For TBird, one might implement a per message, or "all" button/status setting which would allow selective hide/encrypt... 

My primary point is:
FFox and TBird are using same words with conflicting meanings, and should be resolved, if both projects wish to take advantage of pre-existing code/ or improve the mutual code base.  Keeping siloed meanings will turn off people, and taint the Mozilla brand.