Crating a Gem with native code

Hi all,
I need to embed the FireFox engine in a pet project of mine I’m
on. I have a couple of questions.

  1. Does such a Gem already exist? There’s no point in re-inventing
    the wheel if it does.
  2. If not, where can I find a good example of writing a gem with
    embedded code? I’ve looked online, and all the tutorials I’ve found
    only ruby code. I was thinking that the MySQL gem with native
    drivers might
    be a good example, but I’d like to look at a couple more before I