It's hard for people to remember a really strong password. It's impossible for them to remember a lot of them. SitePassword asks you to remember one strong password, but calculates a different, hard to guess password for each site. Plus, SitePassword never stores your passwords, which means you don't have to worry about your password file being stolen.
Let's say you use SitePassword to log into a web site with a couple of less than honorable employees. They have your userid and password for that site, and they can probably guess your sitename. With that information they can start guessing master passwords until they find one that gives your password for the site. Once the bad guys have a match, it's relatively easy for them to guess userids and sitenames at different sites until they get into your bank account and steal all your money. Using a strong master password will make it really hard for them to do that.
Another thing you can do to protect yourself from this guessing attack is to use different master passwords for general surfing and sites you want to protect, like your bank's. That way your money is safe even if bad guys get the master password you use for your favorite fly fishing site.
That's a 'persona.' It lets SitePassword remember different sitenames and usernames for different people who share a machine. Say that you have a machine you leave logged in for your family to use. Each person probably has a different userid and password for the same site, such as Facebook. Without personas, SitePassword would only be able to remember one of them. Family members can replace 'Everyone' with their names, and SitePassword will remember all their site information.
SitePassword doesn't store your master password the way it stores your site information. That means the Chrome extension only remembers your master password until you logout or reboot. SitePassword also forgets your master password if it or your browser is updated. You should also click More and make sure you didn't tell SitePassword to forget your master password every time you use it. On the SitePassword web page, your master password is remembered until you leave the page or reload it.
To save you a click SitePassword guesses when you're done entering your site information. Sometimes it guesses wrong because you left the page or closed the SitePassword popup without first clicking on the web site's password field. On the SitePassword web page, you have to click Remember.
There are a lot of ways to put a password field on the page. Some of them do a really good job of confusing SitePassword. Over time, that should happen less frequently.
See the answer to previous question.
First go to Facebook.com and log in there. Then you won't have to enter your userid or password to log into other sites that support this kind of 'social login.' You can do the same for other 'identity providers,' such as Google or Twitter.