Examine source code of Kemono Extended

{
  "manifest_version": 2,
  "name": "Kemono Extended",
  "version": "2.2",
  "description": "Kemono Extended adds downloading, notifications, easier navigation and much more to Kemono.su and Coomer.su",
  "icons": {
    "48": "./icons/favicon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.kemono.su/*",
        "*://*.coomer.su/*"
      ],
      "js": [
        "./dist/KemonoExtended.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "notifications",
    "downloads",
    "storage",
    "unlimitedStorage",
    "tabs",
    "*://*.kemono.su/*",
    "*://*.coomer.su/*",
    "webRequest",
    "webRequestBlocking",
    "https://cdn.tsyndicate.com/sdk/v1/p.js"
  ],
  "background": {
    "scripts": [
      "./Downloader.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "./Popup.html",
    "default_icon": {
      "48": "./icons/favicon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6a310c79-e6ef-4252-aed8-69e658241fc7}"
    }
  }
}