If you have a LastPass account, there is one way to make the system even more convenient: Installing the site's extension to your browser.

Note that you'll have to download LastPass through the company's website, as the LastPass version available in the Mac's App Store won't allow you to add LastPass to the Safari toolbar.

A web-based attack called clickjacking can get information from password manager browser extensions using auto-fill settings. Here’s how to protect yourself.