Cohesion, fix structural error, improve word choice

"If all you have is a 3kbps connection tethered" --> "If you only have a 3kbps internet connection"
"But traditional text-based browsers..." --> "However, traditional text-based browsers"
"lack JS support and all other modern HTML5 goodness." --> "lack JS and all other modern HTML5 support."
"few more hours life" --> "few more hours of life"