[ubuntu] Unity thinks I'm running Minefield 3.5 instead of Firefox

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http://ubuntuforums.org – For some reason this morning Unity decided that instead of running Firefox 16, I'm actually running Minefield 3.5. If I click the Firefox icon, it loads firefox, but the launcher doesn't change to indicate that firefox is open, and instead has a launcher for Minefield 3.5. Here's a screenshot for an example: http://i.imgur.com/DEg7i.png I looked and I don't appear to have minefield installed. There was a menu entry for minefield that was disabled, and I deleted it. Still the same, after restarts. Halp? (Hardware)