--- a/toolkit/components/extensions/test/xpcshell/test_ext_webRequest_permission.js
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_webRequest_permission.js
@@ -74,16 +74,17 @@ add_task(async function test_permissions
   await contentPage.loadFrameScript(frameScript);
 
   let results = await contentPage.sendMessage("Test:Check", {});
   equal(results.page, "redirected", "Regular webRequest redirect works on an unprivileged page");
   equal(results.script, "redirected", "Regular webRequest redirect works from an unprivileged page");
 
   Services.prefs.setBoolPref(PREF_DISABLE_SECURITY, true);
   Services.prefs.setBoolPref("extensions.webapi.testing", true);
+  Services.prefs.setBoolPref("extensions.webapi.testing.http", true);
 
   results = await contentPage.sendMessage("Test:Check", {});
   equal(results.page, "original", "webRequest redirect fails on a privileged page");
   equal(results.script, "original", "webRequest redirect fails from a privileged page");
 
   await extension.unload();
   await contentPage.close();
 });

--- a/toolkit/mozapps/extensions/AddonManagerWebAPI.cpp
+++ b/toolkit/mozapps/extensions/AddonManagerWebAPI.cpp
@@ -72,17 +72,17 @@ AddonManagerWebAPI::IsValidSite(nsIURI* 
 {
   if (!uri) {
     return false;
   }
 
   bool isSecure;
   nsresult rv = uri->SchemeIs("https", &isSecure);
   if (NS_FAILED(rv) || !isSecure) {
-    if (!(xpc::IsInAutomation() && Preferences::GetBool("extensions.webapi.testing", false))) {
+    if (!(xpc::IsInAutomation() && Preferences::GetBool("extensions.webapi.testing.http", false))) {
       return false;
     }
   }
 
   nsAutoCString host;
   rv = uri->GetHost(host);
   if (NS_FAILED(rv)) {
     return false;