Generic CSS Loader 2 is a simple CSS tool which aims to be an alternative to userChrome.css and userContent.css, or for quick and easy testing of stylesheet codes for Firefox and SeaMonkey Addons developers and web developers. I've expanded a little bit on the original by moving it into the Web Developer menu and making it a resizable window. I've also added a few buttons to automate tasks like adding/removing comment tags, adding !important tags, adding @import lines, and clearing the entire field. It is not a replacement for, or even remotely comparable to Stylish. It also will not load or modify userChrome.css or userContent.css files, but uses a completely separate service.
It is based on the original Generic Chrome CSS Loader developed by Ledrug:https://addons.mozilla.org/en-US/firefox/user/4734157/
You can launch it either from the Tools menu > Web Developer submenu, or by pressing Ctrl+Alt+/. There is also a toolbarbutton available in the Customization deck.
Questions, suggestions, and bug reports should be directed to this forum instead of being posted in a Review: http://forums.mozillazine.org/viewtopic.php?f=48&t=2441483