diff --git a/ext/bg/context.html b/ext/bg/context.html
index 0e50ed7c..394869b1 100644
--- a/ext/bg/context.html
+++ b/ext/bg/context.html
@@ -185,6 +185,6 @@
         <script src="/bg/js/options.js"></script>
         <script src="/bg/js/util.js"></script>
 
-        <script src="/bg/js/context.js"></script>
+        <script src="/bg/js/context-main.js"></script>
     </body>
 </html>
diff --git a/ext/bg/js/context.js b/ext/bg/js/context-main.js
similarity index 95%
rename from ext/bg/js/context.js
rename to ext/bg/js/context-main.js
index e3d4ad4a..67bb4e18 100644
--- a/ext/bg/js/context.js
+++ b/ext/bg/js/context-main.js
@@ -51,7 +51,7 @@ function setupButtonEvents(selector, command, url) {
     }
 }
 
-window.addEventListener('DOMContentLoaded', async () => {
+async function mainInner() {
     await yomichan.prepare();
 
     showExtensionInfo();
@@ -86,4 +86,10 @@ window.addEventListener('DOMContentLoaded', async () => {
             }
         }, 10);
     });
-});
+}
+
+async function main() {
+    window.addEventListener('DOMContentLoaded', mainInner, false);
+}
+
+main();