Bug 1004395 - Uplift Add-on SDK to Firefox r=me

addon-sdk/source/python-lib/cuddlefish/runner.py

@@ -418,7 +418,8 @@ def run_app(harness_root_dir, manifest_rdf, harness_options,
             is_running_tests=False,
             overload_modules=False,
             bundle_sdk=True,
-            pkgdir=""):
+            pkgdir="",
+            enable_e10s=False):
     if binary:
         binary = os.path.expanduser(binary)
 
@@ -430,6 +431,9 @@ def run_app(harness_root_dir, manifest_rdf, harness_options,
     cmdargs = []
     preferences = dict(DEFAULT_COMMON_PREFS)
 
+    if enable_e10s:
+        preferences['browser.tabs.remote.autostart'] = True
+
     # For now, only allow running on Mobile with --force-mobile argument
     if app_type in ["fennec", "fennec-on-device"] and not enable_mobile:
         print """