diff --git a/extension/build.mjs b/extension/build.mjs
index 63e82112..9bfe5461 100644
--- a/extension/build.mjs
+++ b/extension/build.mjs
@@ -2,13 +2,12 @@ import * as esbuild from 'esbuild';
 
 await esbuild.build({
   entryPoints: [
+    { out: 'background.bundle', in: 'src/background/index.ts' },
     { out: 'remote.bundle', in: 'src/remote/index.tsx' },
     { out: 'window.bundle', in: 'src/window/index.tsx' },
   ],
   bundle: true,
   minify: true,
-  splitting: true,
-  format: 'esm',
   outdir: 'dist',
   loader: {
     '.pug': 'empty',
diff --git a/extension/src/background/index.ts b/extension/src/background/index.ts
index c7236e2e..0fc24ea7 100644
--- a/extension/src/background/index.ts
+++ b/extension/src/background/index.ts
@@ -1,3 +1,4 @@
+import '../chromeApiMock';
 import { Store } from 'redux';
 import configureStore, { BackgroundAction } from './store/backgroundStore';
 import openDevToolsWindow, { DevToolsPosition } from './openWindow';