Originally Posted by fjtorres
Dunno about the generics but on the FireHD8.9 I have no problem reading comics, ebooks, or magazines in fullscreen mode with no bars. Most reading/viewing apps have a barless setting and a touch protocol to call up the controls when needed. Bluefire, Overdrive, Coolreader, the various PDF viewers... they all let me use every last pixel of screen for content and only content.
On my ICS/JB tablets (Asus Nexus 7, Toshiba Excite 7.7, Asus Transformer Infinity, Ainol Novo7 Venus), the fullscreen option just dims the navbar but doesn't get rid of it. I remember fullscreen working before on Gingerbread but on ICS/JB, it seems the only way I'd be able to get rid of the navbar is with a custom ROM.