message: Disable source map files from production
  coz MDN don't like
diff: @@ -4,7 +4,6 @@ const webpack = require('webpack');
  const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
  module.exports = {
  - devtool: 'source-map',
  entry: {
  content: './src/content',
  background: './src/background',
  @@ -45,4 +44,6 @@ if (process.env.NODE_ENV === 'production') {
  }
  })
  );
  +} else {
  + module.exports.devtool = 'source-map';
  }
  