Not sure if this has been mentioned before (I probably should have done a search before linking this but it is a bit late); but this Chrome extension adds a few useful things to the steam website ... things like highlighting games\dlc you already own or are in you wish list, showing historic pricing information (i.e. where it is\was cheapest to get the game) and probably a few other things I can't remember.
In short, it adds features Steam should do for you anyway plus some other useful stuff.
As an example, the reason I even remember this was I followed the recently posted link to gone home and it told me it was cheaper to buy the game from Humble (and get a steam key as well as the DRM free version) than to buy direct from Steam!
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That sounds useful especially the knowign what DLC you already have bit I found that steams lack of that basic feature annoying epecially when there is a sale on
NICE.