For folks working with CSS and Firefox, there is an outstanding tool called Aardvark. There is also a javascript bookmarklet that does something similar and can be used in any browser that supports javascript. Simply go to this page and drag the Bookmark this link for MODIv2 link to your bookmarks toolbar. When you want to use it, click the shortcut. (of course, you can skip going to the page and simply drag that link).
I still highly recommend Aardvark.
