a helpful tip for js challenges
To those of you who want to do the JS challenges but can't seem to get Javascript to work in your URL, if you're using FireFox, I've found a really awesome way to get around the filtering and all of that.
If you download the Web Developer add-on (which most of you have I'm sure), you can press CTRL+F4 to open the Javascript "ScratchPad" which is basically a script editor that lets you run javascript. It only runs Javascript relative to the page which you CTRL+F4'd from, but you can always write your own if that's just how you roll.
JS4 will require you to toggle some values in about:config and those keys are "browser.urlbar.filter.javascript" and "noscript.allowURLBarJS" (if you have NoScript, which you should). If you don't know what about:config is, just open a new tab and type "about:config" (without quotation marks) into your location bar and press enter.
Happy hacking.