diff -Nur a/browser/app/profile/icecat.js b/browser/app/profile/icecat.js
--- a/browser/app/profile/icecat.js	2014-10-21 09:53:09.000000000 -0200
+++ b/browser/app/profile/icecat.js	2014-12-19 14:33:04.453900819 -0200
@@ -1235,9 +1235,10 @@
 pref("devtools.commands.dir", "");
 
 // Enable the app manager
-pref("devtools.appmanager.enabled", true);
-pref("devtools.appmanager.lastTab", "help");
-pref("devtools.appmanager.manifestEditor.enabled", true);
+// Note: to enable appmanager is necessary to use a 100% free "Firefox OS" distribution.
+pref("devtools.appmanager.enabled", false);
+pref("devtools.appmanager.lastTab", "");
+pref("devtools.appmanager.manifestEditor.enabled", false);
 
 // Toolbox preferences
 pref("devtools.toolbox.footer.height", 250);