4 files changed, 13 insertions, 1 deletions
diff --git a/components/script/dom/navigator.rs b/components/script/dom/navigator.rs
index 257e1d2dfab..0b96e355a2f 100644
--- a/components/script/dom/navigator.rs
+++ b/components/script/dom/navigator.rs
@@ -54,5 +54,9 @@ impl<'a> NavigatorMethods for JSRef<'a, Navigator> {
     fn UserAgent(self) -> DOMString {
         navigatorinfo::UserAgent()
     }
+
+    fn AppVersion(self) -> DOMString {
+        navigatorinfo::AppVersion()
+    }
 }
 
diff --git a/components/script/dom/navigatorinfo.rs b/components/script/dom/navigatorinfo.rs
index 7dc94d85374..d4aec6999ab 100644
--- a/components/script/dom/navigatorinfo.rs
+++ b/components/script/dom/navigatorinfo.rs
@@ -33,3 +33,7 @@ pub fn UserAgent() -> DOMString {
         None => "".to_owned(),
     }
 }
+
+pub fn AppVersion() -> DOMString {
+    "4.0".to_owned()
+}
diff --git a/components/script/dom/webidls/Navigator.webidl b/components/script/dom/webidls/Navigator.webidl
index 0ce509f4c04..67b5cf95018 100644
--- a/components/script/dom/webidls/Navigator.webidl
+++ b/components/script/dom/webidls/Navigator.webidl
@@ -19,7 +19,7 @@ Navigator implements NavigatorID;
 interface NavigatorID {
   readonly attribute DOMString appCodeName; // constant "Mozilla"
   readonly attribute DOMString appName;
-  //readonly attribute DOMString appVersion;
+  readonly attribute DOMString appVersion;
   readonly attribute DOMString platform;
   readonly attribute DOMString product; // constant "Gecko"
   boolean taintEnabled(); // constant false
diff --git a/components/script/dom/workernavigator.rs b/components/script/dom/workernavigator.rs
index 40c74e78b38..ea446f986cb 100644
--- a/components/script/dom/workernavigator.rs
+++ b/components/script/dom/workernavigator.rs
@@ -55,5 +55,9 @@ impl<'a> WorkerNavigatorMethods for JSRef<'a, WorkerNavigator> {
     fn UserAgent(self) -> DOMString {
         navigatorinfo::UserAgent()
     }
+
+    fn AppVersion(self) -> DOMString {
+        navigatorinfo::AppVersion()
+    }
 }