[ubuntu] Chromium As Default Browser

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http://ubuntuforums.org – Hi everyone, I've just installed Ubuntu 12.04.1 LTS and I'm very impressed. I've just installed Google Chromium on the system because I prefer it to Firefox. I was just wondering how I could go about making this my default browser. I've removed the Firefox icon from the launcher and replaced it with the Chromium one. However, I was in Thunderbird and clicked on a link in my emails and it opened the web page in Firefox. How can I make it so that it'll open in Chromium? Many Thanks, Harvey (Hardware)