I have the brightness set at 100% for my brand new Galaxy SIII, to savor it’s beauty til I lower it to conserve battery. I noticed however; when I launched the browser, the screen brightness automatically dropped to what looked like was the lowest. Fortunately, there’s a setting doing this.
In the browser, press the menu button and go to Brightness and colors:
As you see, the browser has it’s own brightness settings. It is defaulted to automatically dim:
So it doesn’t dim on you, uncheck the automatic brightness box. I up’d the brightness as well to match the brightness I have set for everywhere else.
Hopefully this will help someone else.