diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_globalactor.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_globalactor.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check extension-added global actor API.
+ */
+
+const CHROME_URL = "chrome://mochitests/content/browser/browser/devtools/debugger/test/"
+const ACTORS_URL = CHROME_URL + "testactors.js";
+
+function test() {
+  let gClient;
+
+  if (!DebuggerServer.initialized) {
+    DebuggerServer.init(() => true);
+    DebuggerServer.addBrowserActors();
+  }
+
+  DebuggerServer.addActors(ACTORS_URL);
+
+  let transport = DebuggerServer.connectPipe();
+  gClient = new DebuggerClient(transport);
+  gClient.connect((aType, aTraits) => {
+    is(aType, "browser",
+      "Root actor should identify itself as a browser.");
+
+    gClient.listTabs(aResponse => {
+      let globalActor = aResponse.testGlobalActor1;
+      ok(globalActor, "Found the test tab actor.")
+      ok(globalActor.contains("test_one"),
+        "testGlobalActor1's actorPrefix should be used.");
+
+      gClient.request({ to: globalActor, type: "ping" }, aResponse => {
+        is(aResponse.pong, "pong", "Actor should respond to requests.");
+
+        // Send another ping to see if the same actor is used.
+        gClient.request({ to: globalActor, type: "ping" }, aResponse => {
+          is(aResponse.pong, "pong", "Actor should respond to requests.");
+
+          // Make sure that lazily-created actors are created only once.
+          let conn = transport._serverConnection;
+
+          // First we look for the pool of global actors.
+          let extraPools = conn._extraPools;
+          let globalPool;
+
+          let actorPrefix = conn._prefix + "test_one";
+          let count = 0;
+          for (let pool of extraPools) {
+            count += Object.keys(pool._actors).filter(e => {
+              return e.startsWith(actorPrefix);
+            }).length;
+          }
+          is(count, 2,
+            "Only two actor exists in all pools. One tab actor and one global.");
+
+          gClient.close(finish);
+        });
+      });
+    });
+  });
+}