diff -r 000000000000 -r 6474c204b198 toolkit/crashreporter/test/unit/crasher_subprocess_head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/crashreporter/test/unit/crasher_subprocess_head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+// enable crash reporting first
+let cwd = Components.classes["@mozilla.org/file/directory_service;1"]
+      .getService(Components.interfaces.nsIProperties)
+      .get("CurWorkD", Components.interfaces.nsILocalFile);
+
+// get the temp dir
+let env = Components.classes["@mozilla.org/process/environment;1"].getService(Components.interfaces.nsIEnvironment);
+let _tmpd = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
+_tmpd.initWithPath(env.get("XPCSHELL_TEST_TEMP_DIR"));
+
+let crashReporter =
+  Components.classes["@mozilla.org/toolkit/crash-reporter;1"]
+    .getService(Components.interfaces.nsICrashReporter);
+
+// We need to call this or crash events go in an undefined location.
+crashReporter.UpdateCrashEventsDir();
+
+// Setting the minidump path is not allowed in content processes
+let processType = Components.classes["@mozilla.org/xre/runtime;1"].
+      getService(Components.interfaces.nsIXULRuntime).processType;
+if (processType == Components.interfaces.nsIXULRuntime.PROCESS_TYPE_DEFAULT) {
+  crashReporter.minidumpPath = _tmpd;
+}
+
+let ios = Components.classes["@mozilla.org/network/io-service;1"]
+            .getService(Components.interfaces.nsIIOService);
+let protocolHandler = ios.getProtocolHandler("resource")
+                        .QueryInterface(Components.interfaces.nsIResProtocolHandler);
+let curDirURI = ios.newFileURI(cwd);
+protocolHandler.setSubstitution("test", curDirURI);
+Components.utils.import("resource://test/CrashTestUtils.jsm");
+let crashType = CrashTestUtils.CRASH_INVALID_POINTER_DEREF;