diff --git a/mozilla/mail/app/profile/all-thunderbird.js b/mozilla/mail/app/profile/all-thunderbird.js
index 43ccf28bab4..8f23c0792a3 100644
--- a/mozilla/mail/app/profile/all-thunderbird.js
+++ b/mozilla/mail/app/profile/all-thunderbird.js
@@ -129,8 +129,8 @@ pref("extensions.update.url", "chrome://mozapps/locale/extensions/extensions.pro
 pref("extensions.update.interval", 86400);  // Check for updates to Extensions and 
                                             // Themes every week
 // Non-symmetric (not shared by extensions) extension-specific [update] preferences
-pref("extensions.getMoreExtensionsURL", "http://%LOCALE%.add-ons.mozilla.com/%LOCALE%/%APP%/%VERSION%/extensions/");
-pref("extensions.getMoreThemesURL", "http://%LOCALE%.add-ons.mozilla.com/%LOCALE%/%APP%/%VERSION%/themes/");
+pref("extensions.getMoreExtensionsURL", "https://%LOCALE%.add-ons.mozilla.com/%LOCALE%/%APP%/%VERSION%/extensions/");
+pref("extensions.getMoreThemesURL", "https://%LOCALE%.add-ons.mozilla.com/%LOCALE%/%APP%/%VERSION%/themes/");
 pref("extensions.dss.enabled", false);          // Dynamic Skin Switching                                               
 pref("extensions.dss.switchPending", false);    // Non-dynamic switch pending after next