The Fuller Screen Firefox extension gives you a total scroll, status and nav bar free browser screen for those who desperately need all the monitor real estate they can grab. It also provides a slide show feature which, if you are willing to mess about with CSS and HTML a fair bit, will give you basic Powerpoint type functionality from within the browser. Quite clever really.
This extension enhances the Full Screen mode into a really full screen mode, hiding the remaining toolbars and statusbar and making them visible again when the mouse pointer hits an edge of the screen. It also offers a slideshow mode, enabling @projection CSS rules in a document when full screen mode is turned on. Navigation between slides in implemented in the extension and a slide manager showing thumbnails for the slides is available through shift-F11.