Firefox: toggle visibility of toolbars (using KeyConfig)

FF.toolbar.hide.keyconfig.js

// install the KeyConfig extension from http://mozilla.dorando.at/keyconfig.xpi and add this code as a new key


  // First get all toolbars (that are not the tab bar)
  var tbs = Array.filter(document.querySelectorAll('toolbar'), function (x) {
	// remove // from the below line to keep showing the tabs toolbar:
	//return x.id != 'TabsToolbar';
    return true; 
  });
  // For each toolbar 
  for (var tb of tbs) {
    // Either un-collapse if we collapsed it.
    if (tb.getAttribute('my-addon-collapsed')) {
      tb.removeAttribute('collapsed');
      tb.removeAttribute('my-addon-collapsed');
    }
    // Or collapse other-wise, if not already collapsed
    else if (!tb.getAttribute('collapsed')) {
      tb.setAttribute('collapsed', 'true');
      tb.setAttribute('my-addon-collapsed', 'true');
    }
  }


function toggle_navbar() {
    var nb = document.getElementById('nav-bar');
    if (!nb)
        return;
    nb.style.visibility = (nb.style.visibility == '') ? 'collapse' : '';
    nb.style.overflow = (nb.style.height == '') ? '' : 'hidden';
    }

toggle_navbar();