[ubuntu] Thunderbird launches Firefox

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http://ubuntuforums.org – Hello, In Ubuntu 12.04 I can see this behaviour:in my thunderbird screen when I click in any link inside of email, that action show me the firefox immediately loading the page... that avoid me continue reading the email or click in others links. so I need do ctrol + tab and comeback to TB to continue my reading.... Is there a way to avoid it? so firefox (already open) can load the page behind the scene? (Hardware)