diff -r 000000000000 -r 6474c204b198 toolkit/components/social/test/browser/worker_relative.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/social/test/browser/worker_relative.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+// Used to test XHR in the worker.
+onconnect = function(e) {
+  let port = e.ports[0];
+  let req;
+  try {
+    importScripts("relative_import.js");
+    // the import should have exposed "testVar" and "testFunc" from the module.
+    if (testVar != "oh hai" || testFunc() != "oh hai") {
+      port.postMessage({topic: "done", result: "import worked but global is not available"});
+      return;
+    }
+
+    // causeError will cause a script error, so that we can check the
+    // error location for importScripts'ed files is correct.
+    try {
+      causeError();
+    } catch(e) {
+      let fileName = e.fileName;
+      if (fileName.startsWith("http") &&
+          fileName.endsWith("/relative_import.js") &&
+          e.lineNumber == 4)
+        port.postMessage({topic: "done", result: "ok"});
+      else
+        port.postMessage({topic: "done", result: "invalid error location: " + fileName + ":" + e.lineNumber});
+      return;
+    }
+  } catch(e) {
+    port.postMessage({topic: "done", result: "FAILED to importScripts, " + e.toString() });
+    return;
+  }
+  port.postMessage({topic: "done", result: "FAILED to importScripts, no exception" });
+}