try

config.js

@@ -2,7 +2,10 @@ module.exports = {
     port: process.env.PORT || 5252,
     // Add any other configuration variables here
     allowedOrigins: [
+        'http://localhost',
         'http://localhost:5252',
+        'https://localhost',
+        'https://localhost:5252',
         'https://btcforplebs.com',
         'https://www.btcforplebs.com',
         'http://btcforplebs.com',

public/assets/js/config.js

@@ -3,5 +3,5 @@ const config = {
     // Use services.btcforplebs.com in production, localhost in development
     apiBaseUrl: window.location.hostname === 'localhost' 
         ? 'http://localhost:5252' 
-        : 'https://services.btcforplebs.com'
+        : window.location.protocol + '//services.btcforplebs.com'
 };