Yes, those icons are atrocious and assume the user knows way too much about the app before they use it. Whatever happened to *text*? Swipe right for tabs, swipe left for controls. Done.
(E.g., in MobileSafari there's a uniform way to scroll to the top of any scrolling space
and the location bars and controls are always there. In Fennec, the location bar is attached to the top of the space, but there's no shortcut to get back to the top that I've found, and sometimes when simply scrolling up the location bar appears while in the middle of the page... and I can't find a consistent way to make it appear.)