The LastPass browser extensions (FireFox and Chrome) worked well until about six months ago. Since then it's been awful. Asking me if I want to save a password every time an asynchronous action happens on a web site/application, or not offering to fill in usernames or passwords, or suggesting that I "launch" the page I'm already on, and then not filling that one in either. Sometimes it won't find a password for the site I'm on, even though nothing has changed in years. Kind of useless.