I wrote a Chrome extension for PassZero. It allows users to read their entries and delete them, but not to create new ones. All changes made on the site will sync with the extension and vice-versa. The main benefit of the Chrome extension is that you can access your entries without leaving the current page, quickly and easily. Your email is saved on login for easy access.
The code for the Chrome extension is open source on GitHub, under the MIT license. The Firefox version of this is coming soon.
You can create the Chrome extension directly from the GitHub repo, or download it directly from here.