Hello, when you use a main password, it is systematically asked when you open Firefox, even if the current tab does not need it.
As we do not consult tabs that need a password at each session, this is an unnecessary constraint, and therefore annoying.
It would be better to ask for this password only the first time you choose a tab that uses it during a Firefox session.
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Btw blocking popups/alerts are the most annoying thing in computer history... and the firefox master password promt is an awesome example for this. Please make the master password promt an ambient, non-blocking thing you can just ignore, if you dont want to use it.