Also worth checking out: highlight.js http://softwaremaniacs.org/soft/highlight/en/ (doesn't use jQuery and is modular).

That looks interesting.

Using jQuery in my opinion is a feature - it reduces overall code bloat (DRY) - and integration is easier, since common jQuery idioms are used.

jQuery.Syntax is also highly modular - only the syntax definitions and stylesheets required are loaded. If there is nothing on your page, only a bare minimum (2) scripts are loaded. These scripts are deliberately as short as possible, so that load time is fast.

Does Firebug have anything like this for jQuery written in the console?

I'm not sure I understand your question... do you mean does Firebug have syntax highlighting?

Yes. Your question made me think I am missing something obvious. Maybe http://firerainbow.binaryage.com/ or another add-on?

I have the Firebug out-of-the-box syntax highlighting, but that doesn't apply to JS in the Console or Script windows.