works great! (note that the timeout refers to *inactivity* period) Rated 5 out of 5 stars

I wonder whether the previous/first reviewer expected the master password to time out after the specified number of seconds after it was last entered. I thought that at first, too. Instead, it only times out after the user has been idle/inactive for that period of time.

In other words the purpose is not to make you always re-enter the master password every so many seconds while using the browser. Instead it only protects you for example if you walk away for so many seconds and someone starts using your browser.

BTW, this add-on is in my collection "recommended security & privacy add-ons that are minimally-invasive"