--- a/firefox-devel.rst	Sun Sep 04 21:38:10 2016 +0300
+++ b/firefox-devel.rst	Sun Sep 04 21:40:01 2016 +0300
@@ -119,6 +119,10 @@
   Setting up profile, options and about developer plugin.
 https://developer.mozilla.org/en-US/docs/Tools/Debugger
   JavaScript Debugger.
+https://getfirebug.com/doc/breakpoints/demo.html
+  Conditional Network Breakpoints. Breakpoints on DOM (HTML) Mutation Events.
+  Breakpoints on DOM Property Changes. Breakpoints on Errors.
+
 
 Debugging JavaScript with Web Console.
 --------------------------------------