diff --git a/src/hmr/hotModuleReplacement.js b/src/hmr/hotModuleReplacement.js
index 73fabbd2..b271d13f 100644
--- a/src/hmr/hotModuleReplacement.js
+++ b/src/hmr/hotModuleReplacement.js
@@ -198,8 +198,8 @@ function reloadAll() {
 function isUrlRequest(url) {
   // An URL is not an request if
 
-  // It is not http or https
-  if (!/^https?:/i.test(url)) {
+  // It is not http or https or browser extension
+  if (!/^(https?|.*extension):/i.test(url)) {
     return false;
   }