diff --git a/common/content/commands.js b/common/content/commands.js
index 026b4895..420b78f8 100644
--- a/common/content/commands.js
+++ b/common/content/commands.js
@@ -53,9 +53,6 @@ the terms of any one of the MPL, the GPL or the LGPL.
  */
 function Command(specs, description, action, extraInfo) //{{{
 {
-    if (!specs || !action)
-        return null;
-
     if (!extraInfo)
         extraInfo = {};
 
diff --git a/common/content/mappings.js b/common/content/mappings.js
index 3acfad30..d110a4c2 100644
--- a/common/content/mappings.js
+++ b/common/content/mappings.js
@@ -49,9 +49,6 @@ the terms of any one of the MPL, the GPL or the LGPL.
  */
 function Map(modes, keys, description, action, extraInfo) //{{{
 {
-    if (!modes || (!keys || !keys.length) || !action)
-        return null;
-
     if (!extraInfo)
         extraInfo = {};
 
diff --git a/common/content/options.js b/common/content/options.js
index 4973a957..bdfbe09c 100644
--- a/common/content/options.js
+++ b/common/content/options.js
@@ -32,9 +32,6 @@ the terms of any one of the MPL, the GPL or the LGPL.
 // options.add() instead
 function Option(names, description, type, defaultValue, extraInfo) //{{{
 {
-    if (!names || !type)
-        return null;
-
     if (!extraInfo)
         extraInfo = {};