Examine source code of ChinesePod Filter Mobile

{
  "manifest_version": 2,
  "name": "ChinesePod Filter Mobile",
  "version": "1.2",
  "description": "Show or hide Chinese, Pinyin, and English on older HTML ChinesePod lesson pages",
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "chinesepod-filter-mobile-mobile@example.com",
      "strict_min_version": "113.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "ChinesePod Filter Mobile"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.chinesepod.com/*",
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}