Can't load webpages from applications

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http://askubuntu.com – I am using Ubuntu 12.04 64 bit, Firefox 16.0.01. Whenever I try to open a webpage in a browser from within any application, the browser opens but nothing gets loaded. For eg: From DropBox if I click Launch DropBox Website, Firefox opens but all I get is the Firefox Home Page. How can I solve this problem? (HowTos)