Google's Chrome development team is working on a system to automatically generate passwords, which would help users secure their online identities with passwords that would be diversified across different sites, and are randomized and thus harder to guess.
An interesting Firefox plugin to visualize your passwords and how their related: https://addons.mozilla.org/en-US/firefox/addon/password-reuse-visualizer/
A Chrome.. widget? Addon? thingy?
A Chrome thingy that lets you quickly create and apply custom CSS to websites. You can also use http://stylebot.me to share your custom redesigns with the world (or in this case, other people who know about stylebot).