Useful prefs

// Disable XUL Cache (so you don't have to restart everytime you change a XUL file)
user_pref("nglayout.debug.disable_xul_cache", true);

// Enable dump()
user_pref("browser.dom.window.dump.enabled", true);

// Show chrome errors in the JS console
user_pref("javascript.options.showInConsole", true);

// Enable strict JS warnings
user_pref("javascript.options.strict", true);