feat: add Firefox manifest and webpack config

extension/webpack.firefox.config.js

@@ -0,0 +1,36 @@
+const path = require('path');
+const CopyPlugin = require('copy-webpack-plugin');
+
+module.exports = {
+  entry: {
+    'service-worker': './src/service-worker/index.ts',
+    popup: './src/popup/popup.ts',
+    content: './src/content/detector.ts',
+    setup: './src/setup/setup.ts',
+  },
+  output: {
+    path: path.resolve(__dirname, 'dist-firefox'),
+    filename: '[name].js',
+    clean: true,
+  },
+  resolve: {
+    extensions: ['.ts', '.js'],
+  },
+  module: {
+    rules: [{ test: /\.ts$/, use: 'ts-loader', exclude: /node_modules/ }],
+  },
+  plugins: [
+    new CopyPlugin({
+      patterns: [
+        { from: 'manifest.firefox.json', to: 'manifest.json' },
+        { from: 'src/popup/index.html', to: 'popup.html' },
+        { from: 'src/popup/styles.css', to: 'styles.css' },
+        { from: 'setup.html', to: '.' },
+        { from: 'icons', to: 'icons' },
+        { from: 'wasm/idfoto_wasm_bg.wasm', to: '.' },
+        { from: 'wasm/idfoto_wasm.js', to: '.' },
+      ],
+    }),
+  ],
+  experiments: { asyncWebAssembly: true },
+};