Market prices to match CSGL currency (USD)

Hello,
Pretty sure I am not the only one who dislikes currency inconsistency when hovering on an item.

Before implementing currency conversion, I looked into if it's possible to force a currency on Steam website (to stay on USD at all times). You can't force it on the market listings page (through URL params, as discussed [here](http://stackoverflow.com/questions/22616644/steam-market-currency-and-xml-format)), but you can force it if you are on the [search page results](http://steamcommunity.com/market/search?q=asiimov&l=english&cc=us). 

Also there is issue with xhr.withCredentials property which is ignored if called from Chrome extension.
http://stackoverflow.com/questions/12677608/chrome-extension-ignores-xmlhttprequest-withcredentials-field

There are some workarounds around this with offscreenTabs and modifying/blanking cookies before making request and then restoring cookies after the request is done, but I am not sure if that's a desired solution for this extension.