RES is reddit's long-time web-browser extension that enables all sorts of extra features. It tracks your votes for each user, enables all sorts of hotkeys, allows in-line image and video expansion, enables infinite feed, and many many more features.
We created a version of it for this website, called RES AntiExtreme, or RESAE for short.
RESAE can be downloaded here:
It currently requires chrome to be in "developer mode" for the extension to work, but we're working on getting it in to the app store to remove this problem as well as adding compatibility with other browsers.