Revert pref from bug 337344 temporarily until we can fix unit tests accordingly

browser/app/profile/firefox.js

@@ -551,4 +551,4 @@ pref("accessibility.blockautorefresh", false);
 pref("browser.places.importBookmarksHTML", true);
 
 // Show infobar on chromeless windows
-pref("browser.warn_chromeless_window.infobar", true);
+pref("browser.warn_chromeless_window.infobar", false);