Generate passwords while saving them in your Google sheets.
The My Passwords extension allows you to programmatically generate the same long passwords for your various web accounts every time - without the need of remembering the password. It is a very secure method of managing your passwords because the passwords are not stored anywhere but are generated on demand.
There is even a web version of this extension - for those times - when you don't have your chrome browser around! It is available at http://bit.ly/mypasswordsweb