Rated 4 out of 5 stars
dead simple to use, hit a key to hide what you want, press it again and it's undone. also has other useful features that work in combination with bookmarks and such, very convenient. absolutely essential to save screen realestate, for those who like to view streaming sites and such that use pop out windows for video and chat.
only thing that needs improvement imo is hotkey assignment, and app behaviour for the 'hide all' function. certain combinations of hotkeys don't work sometimes for no apparent reason, but they're reliable when you find ones that do. the 'hide all' function does not remember what toolbars you had visible before hiding them, this would be nice to have, so that there is a quick toggle between custom/no toolbar view.