Is there a way to stop Dropbox from opening Firefox as its default when viewing the Dropbox webpage?

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http://askubuntu.com – I have Dropbox installed on my Ubuntu desktop 12.10, I also have Firefox and Chrome installed. Chrome is my default browser, I have checked in my mimeapps.list and its all correct. Yet for some reason the integration of Dropbox opens Firefox when I use the "Launch Dropbox website" option from the menu, is there a file somewhere this is looking at as I would like it to open in Chrome which I mostly have already running than launching a new instance of Firefox? Or could this be a Dropbox bug? (HowTos)