Add code

Author: MaciekBaron

.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    es6: true,
+    webextensions: true,
+  },
+  extends: [
+    'airbnb-base',
+  ],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaFeatures: {
+      jsx: true,
+    },
+    ecmaVersion: 2018,
+    sourceType: 'module',
+  },
+  plugins: [
+    '@typescript-eslint',
+  ],
+  rules: {
+    'import/extensions': 'off',
+    'linebreak-style': ['error', process.platform === 'win32' ? 'windows' : 'unix'],
+    indent: 'off',
+    '@typescript-eslint/indent': ['error', 2],
+
+  },
+  settings: {
+    'import/resolver': {
+      node: {
+        extensions: ['.js', '.jsx', '.ts', '.tsx'],
+      },
+    },
+  },
+  ignorePatterns: ['extension'],
+};

.gitignore

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+.DS_Store
+Thumbs.db
+.vscode/
+extension/
+node_modules/
+helper.js

LICENSE

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+/* eslint-disable import/no-extraneous-dependencies */
+const esbuild = require('esbuild');
+const fs = require('fs-extra');
+const { version } = require('./package.json');
+
+const OUTPUT_DIR = './extension';
+
+const manifest = {
+  manifest_version: 2,
+  name: 'Bird Site Clown',
+  version,
+  description: 'Clownifies NFT bird site',
+  permissions: ['<all_urls>'],
+  browser_action: {
+    default_popup: 'popup.html',
+  },
+  content_scripts: [
+    {
+      matches: ['<all_urls>'],
+      js: ['content.js'],
+    },
+  ],
+  icons: {
+    48: '48-icon.png',
+    128: '128-icon.png',
+  },
+};
+
+const prepareContent = async () => {
+  try {
+    await fs.emptyDir(OUTPUT_DIR);
+    await Promise.all([
+      fs.writeFile(`${OUTPUT_DIR}/manifest.json`, JSON.stringify(manifest)),
+      fs.copy('./extension_content', OUTPUT_DIR),
+      esbuild.build({
+        entryPoints: ['./src/content.ts'],
+        bundle: true,
+        minify: true,
+        outfile: `${OUTPUT_DIR}/content.js`,
+        plugins: [],
+      }),
+    ]);
+  } catch (err) {
+    // eslint-disable-next-line no-console
+    console.error(err);
+  }
+};
+
+prepareContent();