--- a/firefox-devel.rst	Tue May 31 17:05:38 2011 +0300
+++ b/firefox-devel.rst	Tue Jun 07 14:40:49 2011 +0300
@@ -124,7 +124,7 @@
 
   https://developer.mozilla.org/en/DOM/window.dump
 
-* Components.utils.reportError.
+** Components.utils.reportError.
 
 Write error msg to Error console (not in Web Console).
 
@@ -132,5 +132,8 @@
   // Show the error console.
   toJavaScriptConsole();
 
+Firefox 3.x require set preference 'javascript.options.showInConsole' to 'true' which is
+default value fro Firefox 4.x.
+
   https://developer.mozilla.org/en/Components.utils.reportError