Rated 4 out of 5 stars

This is great. I would like to contribute to this add-on, how can i do it?

Thanks. If you mean contribute technically, I haven't modified it in ages. Feel free to open up the code and make sure it complies with the latest Thunderbird API/style guidelines. I'm sure the whole syntax highlighting guts should really be replaced with some standard library, and this would probably then have support for more than just C/C++.

If you mean how can you contribute financially, I just did it for fun but feel free to donate to the World Wildlife Fund or the charity of your choice on my behalf. Or Mozilla or Mercurial if you want a technical donation.