Press F3 in Firefox, it brings up the Find interface.(Search in page.) F5 does not work in Chrome or Safari, but works in nearly everything else I use. F6 - I

Press F3 in Firefox, it brings up the Find interface.(Search in page.) F5 does not work in Chrome or Safari, but works in nearly everything else I use. F6 - It is a tabbing functionality for application input boxes, but related Firefox and other applications with similar design. I actually have the top left corner set to do Expose all windows as well.