A pair of userscripts meant to ease Steam (more specifically TF2) trading. Autofills currencies (keys, ref, reclaimed, scrap) for bacpack.tf orders in the Steam new trade offer window.
While the backpack.tf integration was written completely by me, the original Steam Trade Offer Enhancer was made by HusKy (Steam). The improved version has a few new features, such as a warning when you do not have enough items, and the backpack.tf integration support.
To install these two userscripts, use a userscript manager like Tampermonkey. Browser addons are available for Chrome, Firefox, Edge and a bunch of other browsers.
Once installed, install both userscripts by clicking on the links below:
Improved Steam Trade Offer Enhancer features everything from the latest 1.4.2 HusKy version. In addition, it warns the user when trying to add more items than you have available, as well as supports auto-fillling currencies on load by specifying URL parameters, which is in turn used by the backpack.tf integration. Another feature is a button shortcut for adding pure (keys/ref/rec/scrap) currencies without having to search them each time.
The Backpack.tf Integration run on backpack.tf classifields pages where it scans each one for the requested value and auto-fills the Steam Trade Offer window when/if you click on the trade link on the classifield. Always double check the results, the script is not foolproof!