I have since updated this script, Read the newest blog post on this topic here:

http://p337.info/blog/steam-marketplace-script-updated/

So I spent last night trying to combat an issue with the Steam Marketplace,
CS:GO is my new favorite game, and offloading all the sticker capsules and skins has left my marketplace transaction sales list quite long,  Meaning I have 14 items to scroll past before I get to the actual sales items

I don’t know if anyone could actually benefit from my UserScript,
But It adds the ability to hide your listed marketplace items, and additionally load one of the tabs automatically in the “Market Activity” section further down the page. (instead of always loading the “Popular Items” – which rarely changes)

with the settings seen above, my page now loads like the below screenshot without any clicking;
notice That the “My Activity Listings (14)” is collapsed, and “Newly Listed” is already selected by default

This user-script utilises HTML5 localStorage functionality in JavaScript, and at the moment is only compatible with Firefox (now compatible with Chrome if you install Tamper monkey), your Firefox version must be above version 3.5 and “dom.storage.enabled” set to true (you’ll only need to check this for per-historic version of Firefox) and you’ll obviously need Greasemonkey installed to run User-scripts.

Ive been using this script for the last 2 years, and editing as I go, I might make a major update soon.

If you are sceptical about whats inside, you can view the code below on Pastebin
As with any external script, make sure you be careful and know what you’re running.

Current Version
http://p337.info/blog/steam-marketplace-script-updated/