Examine source code of Fluent Translator

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_extName__",
  "version": "1.0.0",
  "description": "__MSG_extDesc__",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "24": "assets/icons/icon24.png",
      "32": "assets/icons/icon32.png",
      "64": "assets/icons/icon64.png",
      "128": "assets/icons/icon128.png",
      "256": "assets/icons/icon256.png",
      "512": "assets/icons/icon512.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "24": "assets/icons/icon24.png",
    "32": "assets/icons/icon32.png",
    "64": "assets/icons/icon64.png",
    "128": "assets/icons/icon128.png",
    "256": "assets/icons/icon256.png",
    "512": "assets/icons/icon512.png"
  },
  "background": {
    "scripts": [
      "src/background/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/content.js"
      ],
      "css": [
        "src/content/content.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7fbd2634-4dc5-4d5c-abde-e08072ed288d}"
    }
  }
}