Examine source code of Boosty Downloader

{
  "manifest_version": 2,
  "name": "Boosty Downloader",
  "version": "9.1",
  "description": "Download videos, audio and images from Boosty",
  "browser_specific_settings": {
    "gecko": {
      "id": "boosty-downloader@extension",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "permissions": [
    "downloads",
    "storage",
    "activeTab",
    "https://api.boosty.to/*",
    "https://boosty.to/*",
    "https://*.boosty.to/*",
    "https://*.okcdn.ru/*",
    "https://*.mycdn.me/*",
    "https://cdn.boosty.to/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://boosty.to/*",
        "https://*.boosty.to/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "icons/*",
    "thankyou.html",
    "thankyou.js"
  ]
}