Thunderbird has hijacked Safari rss feeds - how do I stop this?

I installed Thunderbird a while back just to test its functionality. I use apple Mail.

Ever since, when I follow a link to an RSS feed in Safari, Thunderbird opens automatically. But I want to get the feed sent to Mail.

Does anyone know how Thunderbird is doing this. I can't find any options in Safari or Thunderbird to prevent this behaviour. And even when I deleted Thunderbird, Safari still tried to install it.

Please help!

Al