Examine source code of MyWords2

{
  "manifest_version": 2,
  "name": "MyWords2",
  "author": "Mikhail Derachits",
  "developer": {
    "name": "Mikhail Derachits"
  },
  "version": "9.5",
  "description": "Word tranlator",
  "browser_action": {
    "default_icon": {
      "16": "image-16.png",
      "32": "image-32.png"
    },
    "browser_style": true,
    "default_title": "MyWords2"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "*://translate.google.com/*",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d097b8f8-7c32-49bc-9f04-2c4649d28ee6}"
    }
  }
}