diff --git a/src/handleSubmit.ts b/src/handleSubmit.ts
index ba2b684..e81e07f 100644
--- a/src/handleSubmit.ts
+++ b/src/handleSubmit.ts
@@ -111,7 +111,10 @@ export const handleSubmit = async (
         focused: true,
     });
 
-    if (typeof browser !== 'undefined') {
+    if (
+        typeof browser !== 'undefined' &&
+        typeof browser.tabs?.executeScript === 'function'
+    ) {
         await browser.tabs.executeScript(tab.id, {
             file: '/dist/injectedScript.js',
         });