Question: I love using irb to quickly check how my ruby code reacts. Im wondering is there a way to do the same say in Firebug or soem other tool?

Answer: 
Sure, start up Firebug while using any page that has jquery loaded and type commands into the console. Am I missing something?
I was googling for irb and jquery. Much better would have been injecting jquery firebug.

Found this 

<http://www.learningjquery.com/2006/12/jquerify-bookmarklet>

and it answers my question. If any one has any other tips please share.