--- a/b2g/chrome/content/shell.js
+++ b/b2g/chrome/content/shell.js
@@ -631,17 +631,35 @@ var shell = {
       Services.obs.notifyObservers(null, "browser-ui-startup-complete", "");
 
       SystemAppProxy.setIsReady();
       if ('pendingChromeEvents' in shell) {
         shell.pendingChromeEvents.forEach((shell.sendChromeEvent).bind(shell));
       }
       delete shell.pendingChromeEvents;
     });
-  }
+
+    shell.handleCmdLine();
+  },
+
+  handleCmdLine: function shell_handleCmdLine() {
+    let b2gcmds = Cc["@mozilla.org/commandlinehandler/general-startup;1?type=b2gcmds"]
+                    .getService(Ci.nsISupports);
+    let args = b2gcmds.wrappedJSObject.cmdLine;
+    try {
+      // Returns null if -url is not present
+      let url = args.handleFlagWithParam("url", false);
+      if (url) {
+        this.sendChromeEvent({type: "mozbrowseropenwindow", url});
+        args.preventDefault = true;
+      }
+    } catch(e) {
+      // Throws if -url is present with no params
+    }
+  },
 };
 
 Services.obs.addObserver(function onFullscreenOriginChange(subject, topic, data) {
   shell.sendChromeEvent({ type: "fullscreenoriginchange",
                           fullscreenorigin: data });
 }, "fullscreen-origin-change", false);
 
 DOMApplicationRegistry.registryStarted.then(function () {

--- a/b2g/components/CommandLine.js
+++ b/b2g/components/CommandLine.js
@@ -10,16 +10,20 @@ XPCOMUtils.defineLazyModuleGetter(this, 
 
 function CommandlineHandler() {
   this.wrappedJSObject = this;
 }
 
 CommandlineHandler.prototype = {
     handle: function(cmdLine) {
       this.cmdLine = cmdLine;
+      let win = Services.wm.getMostRecentWindow("navigator:browser");
+      if (win && win.shell) {
+        win.shell.handleCmdLine();
+      }
     },
 
     helpInfo: "",
     classID: Components.ID("{385993fe-8710-4621-9fb1-00a09d8bec37}"),
     QueryInterface: XPCOMUtils.generateQI([Ci.nsICommandLineHandler]),
 };
 
 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([CommandlineHandler]);