I love this app, but this extension has one odd behavior that keeps it from 5 stars:

If you hit the SafeInCloud button and have multiple entries for a given website, you receive a list of accounts for that site. The problem is, if you hit the down arrow to jump through the options, you jump UP through the entries instead of down. And if you hit up, you go down. The chrome extension is fine in this department. It's just the firefox one that is reversed.