Backed out changeset 489046125fa6 (bug 897683) due to Ubuntu debug Jetpack perma-orange.

addon-sdk/source/python-lib/mozrunner/winprocess.py

@@ -330,9 +330,13 @@ GetExitCodeProcess = GetExitCodeProcessProto(
 GetExitCodeProcess.errcheck = ErrCheckBool
 
 def CanCreateJobObject():
-    # Running firefox in a job (from cfx) hangs on sites using flash plugin
-    # so job creation is turned off for now. (see Bug 768651).
-    return False
+    currentProc = GetCurrentProcess()
+    if IsProcessInJob(currentProc):
+        jobinfo = QueryInformationJobObject(HANDLE(0), 'JobObjectExtendedLimitInformation')
+        limitflags = jobinfo['BasicLimitInformation']['LimitFlags']
+        return bool(limitflags & JOB_OBJECT_LIMIT_BREAKAWAY_OK) or bool(limitflags & JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK)
+    else:
+        return True
 
 ### testing functions