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Things do get rearranged, so you may find it under a slightly different menu but you're looking for the Error Console in Firebug. What will happen is it will pop up this separate window. I'm going to clear that and just keep that open in the background while I'm experimenting with the page. So it's not showing me anything right now, but as I move this page, I'm going to go around and say click on this. I click on Interesting Headline three times and over here in the Error Console I've got three errors. Now, it's actually telling me, the error is fourthfunction is not defined.
Meaning, you're trying to use something called fourthfunction, I don't know what that is. In fact, I even have a link to the file where the problem is and it's telling me the issues on line 9. If I click the link, it opens up a view of that and even highlights the line for me. So I can go straight to that line and figure out, okay, there is the problem, and hopefully I see that it's because I'm spelling fourthfunction with a lowercase f, whereas the actual definition of the function uses the uppercase F for the word Function here.
If you have other errors in syntax, you may find several of them showing up as soon as you load the page. General rule of thumb, if you've got multiple ones, go from the top down. Fix the first one first, because early errors can actually upset the rest of your code. Well, that's the Error Console in Firefox. There is also an option called the Web Console which is equivalent, but actually gives you this window at the top of the page and as I click in here, we get the same message. fourthfunction is not defined.
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