In addition to other plugins mentioned in earlier comments, there's also a plugin for viewing the source of a selection. I use it all the time. In the extension management area, search for "view selection source". It actually pops up a couple different ones that do the same thing but with different interface styles. Try 'em both out and see which one ya like.
Ivo Fokkema - 2010-05-07 08:29:59 - In reply to message 2 from Manuel Lemos