Rated 5 out of 5 stars
Works well, and the ubiquitous availability across platforms and browsers is its most useful feature. The plugin is always updated quickly when needed.
While there are always some sites where the autologin doesn't work properly this is to be expected with the amount of websites and login methods available. Using Lastpass has saved me tremendous frustration, clears my head of remembering a dozen passwords and has made it possible to have a different one for every site (over 300 now).
Note: this plugin requires a LastPass account and is not useful stand-alone.