diff --git a/routes/_actions/addInstance.js b/routes/_actions/addInstance.js
index 9fabce8f..0eba16e0 100644
--- a/routes/_actions/addInstance.js
+++ b/routes/_actions/addInstance.js
@@ -46,7 +46,7 @@ export async function logInToInstance () {
     console.error(err)
     let error = `${err.message || err.name}. ` +
       (navigator.onLine
-        ? `Is this a valid Mastodon instance?`
+        ? `Is this a valid Mastodon instance? Is a browser extension blocking the request?`
         : `Are you offline?`)
     store.set({
       logInToInstanceError: error,