// Toggle the Bookmarks toolbar
var toolbar = document.getElementById('PersonalToolbar');
toolbar.collapsed = !toolbar.collapsed;// Toggle the Web Developer toolbar
// see web_developer.xpi/chrome/webdeveloper.jar/content/webdeveloper/webdeveloper.js
var toolbar = document.getElementById('webdeveloper-toolbar');
toolbar.collapsed = !toolbar.collapsed;Posted May 11, 2009.
https://www.darklaunch.com/2009/05/11/toggle-firefox-toolbars-webdeveloper-toolbar-keyconfig.html