Yes, please correct the master password feature to function properly. It should not be possible to access already downloaded emails to inbox when you click on Cancel button in password prompt.
Agreed with OP, I have no idea who designed it this way. As it is now, master password is basically useless feature. Mozilla devs please correct this issue.
I agree with the OP when Cancel option is selected for master password it should not open the application for anyone to view the mailbox. What is the point of master password when it lets you in to the application? I thought this is supposed to be se...
