--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -5862,17 +5862,17 @@ HTMLMediaElement::OpenUnsupportedMediaWi
   // If media doesn't start playing, we don't need to open it.
   if (mPaused) {
     return;
   }
 
   LOG(LogLevel::Debug, ("Open unsupported type \'%s\' with external apps.",
       mMimeType.get()));
   nsContentUtils::DispatchTrustedEvent(OwnerDoc(), static_cast<nsIContent*>(this),
-                                       NS_LITERAL_STRING("OpenMediaWithExtenalApp"),
+                                       NS_LITERAL_STRING("OpenMediaWithExternalApp"),
                                        true,
                                        true);
 }
 
 static const char* VisibilityString(Visibility aVisibility) {
   switch(aVisibility) {
     case Visibility::UNTRACKED: {
       return "UNTRACKED";

--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -4686,17 +4686,17 @@ var BrowserEventHandler = {
       Services.obs.addObserver(this, "dom-touch-listener-added", false);
       BrowserApp.deck.addEventListener("touchstart", this, true);
     } else {
       BrowserApp.deck.addEventListener("touchend", this, true);
     }
 
     BrowserApp.deck.addEventListener("DOMUpdatePageReport", PopupBlockerObserver.onUpdatePageReport, false);
     BrowserApp.deck.addEventListener("MozMouseHittest", this, true);
-    BrowserApp.deck.addEventListener("OpenMediaWithExtenalApp", this, true);
+    BrowserApp.deck.addEventListener("OpenMediaWithExternalApp", this, true);
 
     InitLater(() => BrowserApp.deck.addEventListener("click", InputWidgetHelper, true));
     InitLater(() => BrowserApp.deck.addEventListener("click", SelectHelper, true));
 
     // ReaderViews support backPress listeners.
     Messaging.addListener(() => {
       return Reader.onBackPress(BrowserApp.selectedTab.id);
     }, "Browser:OnBackPressed");
@@ -4710,17 +4710,17 @@ var BrowserEventHandler = {
       case 'touchend':
         if (this._inCluster) {
           aEvent.preventDefault();
         }
         break;
       case 'MozMouseHittest':
         this._handleRetargetedTouchStart(aEvent);
         break;
-      case 'OpenMediaWithExtenalApp':
+      case 'OpenMediaWithExternalApp':
         ExternalApps.openExternal(aEvent.target);
         break;
     }
   },
 
   _handleTouchStart: function(aEvent) {
     if (!BrowserApp.isBrowserContentDocumentDisplayed() || aEvent.touches.length > 1 || aEvent.defaultPrevented)
       return;