diff --git a/src-main/protocols.js b/src-main/protocols.js
index 2eaa881..f93d699 100644
--- a/src-main/protocols.js
+++ b/src-main/protocols.js
@@ -56,6 +56,7 @@ const FILE_SCHEMES = {
 const MIME_TYPES = new Map();
 MIME_TYPES.set('.html', 'text/html');
 MIME_TYPES.set('.js', 'text/javascript');
+MIME_TYPES.set('.map', 'application/json');
 MIME_TYPES.set('.txt', 'text/plain');
 MIME_TYPES.set('.json', 'application/json');
 MIME_TYPES.set('.wav', 'audio/wav');
diff --git a/webpack.config.js b/webpack.config.js
index f7feacb..9074230 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -4,7 +4,7 @@ const CopyWebpackPlugin = require('copy-webpack-plugin');
 
 const base = {
     mode: process.env.NODE_ENV === 'production' ? 'production' : 'development',
-    devtool: process.env.NODE_ENV === 'production' ? false : 'eval',
+    devtool: process.env.NODE_ENV === 'production' ? false : 'cheap-source-map',
     target: 'web',
     module: {
         rules: [