--- a/firefox-devel.rst	Mon Jun 06 23:03:28 2016 +0300
+++ b/firefox-devel.rst	Fri Jun 17 10:22:08 2016 +0300
@@ -75,7 +75,8 @@
 Extension security.
 ===================
 
- * https://developer.mozilla.org/en/Security_best_practices_in_extensions
+* https://developer.mozilla.org/en/Security_best_practices_in_extensions
+* https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox
 
 Debugging in Firefox.
 =====================