Examine source code of Page Translator

{
  "manifest_version": 2,
  "name": "PageTranslator",
  "version": "2.1.2",
  "description": "Translate an Entire Web Page",
  "author": "Fire360Boy | Fire360Boy@gmail.com",
  "icons": {
    "64": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "64": "icon.png"
    },
    "default_title": "Click To Translate This Page",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "*://*/*",
    "<all_urls>",
    "tabs",
    "storage"
  ]
}