Examine source code of 谷歌翻译

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      "run_at": "document_end"
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      }
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    "gecko_android": {
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  },
  "description": "View translations easily as you browse the web.",
  "default_locale": "en",
  "icons": {
    "128": "icons/icon.png"
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  "host_permissions": [
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  "short_name": "Translate",
  "name": "In Page Translate",
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    "page": "options.html"
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  "background": {
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    "default_title": "Translate",
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icons/icon.png"
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    "extension_pages": "script-src 'self'; object-src 'self';"
  },
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    "storage",
    "tabs",
    "contextMenus",
    "declarativeNetRequest"
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}