Ubuntu 12.04 Battery problem

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http://askubuntu.com – I have my laptop ( Dell Inspiron 14R) on dual boot with Ubuntu 12.04 and Windows 7. While using windows 7, I used to get about 2.5-3 hours on battery fully charged (with my cellphone connected for 3g internet) . The battery is almost 2 years old. But in Ubuntu 12.04, I'm getting only about 1-1.5 hrs on battery. I tried installing jupiter, also tried some tweaks that were mentioned in the forums, like editing the grub file. But nothing seems to work. I am not sure if any app is draining the battery. The one application that I use always is firefox. It's always open. Is there any way i could (HowTos)