There was another add-on called Toolbar Autohide that used to hide the Toolbar + Addressbar and worked like a charm. You could set the sensitivity, height and

There was another add-on called Toolbar Autohide that used to hide the Toolbar + Addressbar and worked like a charm. You could set the sensitivity, height and other tweaks to control the collapsing of the hidden bars. Using undecorated windows, that left me with nothing but a window of the web page. No addressbar, no tab bar but available at a quick mouseover. I hope there's some way of achieving this in FF Quantum. I already have the TST plugin with the F1 key toggle and hidden tab bar.