Steam Trader Helper is a web-based application aimed at helping users to make the most out of their Steam trading. It is designed to make it easier for users to manage their Steam inventory, track their Steam market transactions, and analyze their Steam trading history. It features a user-friendly interface, allowing users to quickly and easily access their Steam trading information. Additionally, the app allows users to customize their settings to suit their individual needs, making it easy to access their Steam trading data on the go. Steam Trader Helper also provides an in-depth look at the market, allowing users to make informed decisions when trading items. With this app, users can easily and quickly track their Steam trading progress, ensuring they get the most out of their Steam trading experience.
Warning The extension requests dangerous permissions and is reportedly monitoring and sending your online activity to its own server, for promotional stuff it seems: https://www.reddit.com/r/GlobalOffensive/comments/70xofs/warning_trusted_steam_inventory_helper_now/
Enhanced Steam
Steam Inventory Helper
Steam Tiles
Discontinued As of July 2018, the extension has been discontinued. See http://www.enhancedsteam.com/blog/?p=256