Examine source code of Scientific Calculator

{
  "manifest_version": 2,
  "name": "Scientific Calculator",
  "version": "1.13.1",
  "short_name": "Calculator",
  "description": "Scientific Calculator for Firefox",
  "offline_enabled": true,
  "browser_action": {
    "default_title": "Calculator",
    "default_icon": "icon128.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "./take_sdk/content.bundle.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "./take_sdk/background.bundle.js"
    ]
  },
  "permissions": [
    "https://*.takeads.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{315684d3-b9e7-472d-ace1-7aac718c8b84}"
    }
  }
}