Examine source code of Gif Kitty

{
  "manifest_version": 2,
  "name": "Gifkitty",
  "version": "1.2resigned1",
  "description": "Gif Picker for Product Hunt",
  "content_scripts": [
    {
      "matches": [
        "*://*.producthunt.com/*"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "app.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ],
  "permissions": [
    "*://api.giphy.com/*",
    "webRequest"
  ],
  "web_accessible_resources": [
    "giphy.png"
  ],
  "icons": {
    "48": "icons/gk-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e40391a-ac13-4e92-a8c6-aa3e056225de}"
    }
  }
}