"Local" master password

Hi

First time on this forum... maybe question or suggestion already posted, but I hadn't found it.

I'm using your addon to check above 10 mailboxes in 10 minutes interval. Unfortunately, some times, I must allow some of my coleguages and bosses to work in my PC and browser. But I don't want to allow them even see which e-mail addresses I have.

It will  be a great feature to have some kind of "local" master password. It can even replace master password feature in FireFox and bring it to Chrome, which haven't such must-have feature!

So, my suggestion...

1) before start checking and even displaying e-mails to be checked, addon asking "local" password (which even can differs form browser's master password). If password matched - addon begin to work. 

2) in addon's toolbar icon menu appears new item - "Lock". when press it - addon stops checking, hides all e-mails in menu and adds "Unlock" item.

3) If I press "Unlock" menu item, addon asking me again my "local" master password and all starting from the begining.

Please, notice, that this is a great advantage for Chrome, which haven't "master password" feature, while this suggestion really can replace its absence.