--- a/firefox.rst	Sat Dec 12 11:52:07 2015 +0200
+++ b/firefox.rst	Sun Dec 13 14:29:47 2015 +0200
@@ -58,6 +58,9 @@
   $ firefox -P second-profile-name -no-remote
   $ firefox -P third-profile-name -no-remote
 
+  https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options
+    Firefox command line options.
+
 How backup and restore profile.
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