diff --git a/devtools/client/debugger/test/mochitest/addon1.xpi b/devtools/client/debugger/test/mochitest/addon1.xpi
index b77ec953125..689689ebe8a 100644
Binary files a/devtools/client/debugger/test/mochitest/addon1.xpi and b/devtools/client/debugger/test/mochitest/addon1.xpi differ
diff --git a/devtools/client/debugger/test/mochitest/addon2.xpi b/devtools/client/debugger/test/mochitest/addon2.xpi
index 460eaca8a28..8f6ec6dc167 100644
Binary files a/devtools/client/debugger/test/mochitest/addon2.xpi and b/devtools/client/debugger/test/mochitest/addon2.xpi differ
diff --git a/devtools/client/debugger/test/mochitest/addon3.xpi b/devtools/client/debugger/test/mochitest/addon3.xpi
index 673b31b9d17..cf17a2f80ed 100644
Binary files a/devtools/client/debugger/test/mochitest/addon3.xpi and b/devtools/client/debugger/test/mochitest/addon3.xpi differ
diff --git a/devtools/client/debugger/test/mochitest/addon4.xpi b/devtools/client/debugger/test/mochitest/addon4.xpi
index 56dc98f6e01..1f6f106f3c3 100644
Binary files a/devtools/client/debugger/test/mochitest/addon4.xpi and b/devtools/client/debugger/test/mochitest/addon4.xpi differ
diff --git a/devtools/client/debugger/test/mochitest/addon5.xpi b/devtools/client/debugger/test/mochitest/addon5.xpi
index 16991f7a06a..56b38761d21 100644
Binary files a/devtools/client/debugger/test/mochitest/addon5.xpi and b/devtools/client/debugger/test/mochitest/addon5.xpi differ
diff --git a/testing/profiles/prefs_general.js b/testing/profiles/prefs_general.js
index 6275a4ae84e..4e04bb85bb2 100644
--- a/testing/profiles/prefs_general.js
+++ b/testing/profiles/prefs_general.js
@@ -70,7 +70,6 @@ user_pref("extensions.getAddons.cache.enabled", false);
 user_pref("extensions.installDistroAddons", false);
 // XPI extensions are required for test harnesses to load
 user_pref("extensions.defaultProviders.enabled", true);
-// Disable signature requirements where possible
 user_pref("xpinstall.signatures.required", false);
 
 user_pref("geo.wifi.uri", "http://%(server)s/tests/dom/tests/mochitest/geolocation/network_geolocation.sjs");
diff --git a/toolkit/mozapps/extensions/test/mochitest/file_bug687194.xpi b/toolkit/mozapps/extensions/test/mochitest/file_bug687194.xpi
index dfc03505336..e215cffad8a 100644
Binary files a/toolkit/mozapps/extensions/test/mochitest/file_bug687194.xpi and b/toolkit/mozapps/extensions/test/mochitest/file_bug687194.xpi differ