[all variants] Bumblebee and Firefox - Is it worth it?

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http://ubuntuforums.org – Hi all, I just got my brand new Lenovo T430u with an Intel® HD 4000 Graphics and an NVIDIA® GeForce® GT 620M chipset in an Nvidia Optimus setup. I have installed bumblebee and witnessed the awesome performance of the NVidia chipset. Then I started configuring which apps I want to use the nvidia chip. I am wondering if it is worth it to configure Firefox and Chrome to use the nvidia chip or would it be just a waste of energy and battery since the Intel HD 4000 is extremely fast as well? I would appreciate your input, thank you. (Hardware)