Bug 1836042: Disable xpc::IsInAutomation() in test_signed_langpack. r=extension-reviewers,robwu

Differential Revision: https://phabricator.services.mozilla.com/D179608

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

@@ -1,6 +1,13 @@
 const PREF_SIGNATURES_GENERAL = "xpinstall.signatures.required";
 const PREF_SIGNATURES_LANGPACKS = "extensions.langpacks.signatures.required";
 
+// Disable "xpc::IsInAutomation()", since it would override the behavior
+// we're testing for.
+Services.prefs.setBoolPref(
+  "security.turn_off_all_security_so_that_viruses_can_take_over_this_computer",
+  false
+);
+
 // Try to install the given XPI file, and assert that the install
 // succeeds.  Uninstalls before returning.
 async function installShouldSucceed(file) {