user_pref("browser.fullscreen.animateUp",          "0"); //disable fullscreen animation
user_pref("browser.compactmode.show",             true); //enable compact modus
user_pref("browser.backspace_action",              "0"); //enable backspace for 'page back', default = 2
user_pref("browser.aboutConfig.showWarning",     false); //disabe about:config-warning
user_pref("browser.tabs.closeWindowWithLastTab", false); //don't quit browser while close last tab.
user_pref("full-screen-api.warning.timeout",         0); //disable full screen warning message
user_pref("pdfjs.disabled",                       true); //disable internal pdf reader
user_pref("browser.startup.homepage",    "about:blank"); //no startup page