Generic CSS Loader 2 is a simple CSS tool which aims to be an alternative to userChrome.css, or for quick and easy testing of stylesheet codes for Firefox 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+/. (Keyboard shortcut changed from Ctrl+Alt+G to avoid conflicts with European keyboards. Let me know if you have problems with it.)
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