Examine source code of REST Client APIsHub

{
  "name": "REST Client APIsHub",
  "version": "2.5",
  "manifest_version": 2,
  "author": "Abdul Qadir (abdulqadirshaikh101@gmail.com)",
  "description": "A Modern and simple API testing tool!",
  "incognito": "spanning",
  "icons": {
    "16": "icons/icon-16.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://restclient.apishub.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage",
    "<all_urls>",
    "downloads",
    "clipboardRead",
    "webRequest"
  ],
  "browser_action": {
    "default_icon": {
      "19": "icons/icon-19.png",
      "38": "icons/icon-38.png"
    },
    "default_title": "REST Client APIsHub"
  }
}