Here's an oddity that may interest some of you.
The string
javascript: (all by itself) will pop up the error console if it's embedded in a page, used as hyperlink or simply pasted to the address bar. It does so in the latest gecko for KM 1.5.4 at least.
I startpaged "error console pops up" and discovered it's a known issue:
http://www.velocityreviews.com/forums/t590971-how-do-i-go-about-disabling-the-error-console-in-firefox.html
I happened to visit the "answers" site
http://zhidao.baidu.com and the error console would pop up any time a page was loaded (any of the "question" links in the center column there will trigger it). I'd never seen this before and was curious how it could even be possible! It turns out they have "javascript:" embedded as an iframe in one of their forms.
test:
forum url tag with "javascript:" as the target