Bug 595831: Stop tests from accessing the update servers by default. r=robstrong, a=tests

toolkit/mozapps/extensions/test/xpcshell/head_addons.js

@@ -1013,6 +1013,10 @@ Services.prefs.setBoolPref("extensions.showMismatchUI", false);
 // By default, don't cache add-ons in AddonRepository.jsm
 Services.prefs.setBoolPref("extensions.getAddons.cache.enabled", false);
 
+// Point update checks to the local machine for fast failures
+Services.prefs.setCharPref("extensions.update.url", "http://127.0.0.1/updateURL");
+Services.prefs.setCharPref("extensions.blocklist.url", "http://127.0.0.1/blocklistURL");
+
 // Register a temporary directory for the tests.
 const gTmpD = gProfD.clone();
 gTmpD.append("temp");