If you use Firefox, Chrome, or Opera just download it now!

Adds tons additional features to Steam pages. My favorite is the low price calculator so you can quickly tell what the lowest recorded is. isthereanydeal.com is also an excellent price comparison site (sign up for the bundle newsletters).

I was just thinking how ES would be great if it actually worked in the Steam client but since it's a browser
addon I didn't think there would be support. Turns out there is now Steam client support.