diff --git a/extension/background.js b/extension/background.js
index cb4ff04..fa43ec5 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -110,6 +110,9 @@ async function handleContentScriptMessage({type, params, host}) {
 
         return result
       }
+      case 'ping': {
+        return 'pong'
+      }
     }
 
     return
diff --git a/extension/common.js b/extension/common.js
index 5264fe2..3042a56 100644
--- a/extension/common.js
+++ b/extension/common.js
@@ -1,6 +1,7 @@
 import browser from 'webextension-polyfill'
 
 export const NO_PERMISSIONS_REQUIRED = {
+  ping: true,
   replaceURL: true
 }