Ah right right, from the looks of it , it must be Steam Inventory Helper , an extension for Chrome.
Check here: https://chrome.google.com/webstore/detail/steam-inventory-helper/cmeakgjggjdlcpncigglobpjbkabhmjl
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Sorry for the bad Quality, it's on High. Basically it shows the price of ur and the price of the one uir trading with items. And yea.. Pretty helpfull.
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