Examine source code of Booru HotKeys

{
  "manifest_version": 3,
  "name": "Booru HotKeys",
  "version": "1.3",
  "description": "Adds hotkeys such as pagination shortcuts to supported websites.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{06d85fde-d1f4-464a-a560-5136f777c11a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.rule34.xxx/*",
        "*://*.gelbooru.com/*",
        "*://*.xbooru.com/*",
        "*://*.safebooru.org/*"
      ],
      "js": [
        "common/navigation.js",
        "case1.js"
      ]
    },
    {
      "matches": [
        "*://*.fanservice.fan/*"
      ],
      "js": [
        "common/navigation.js",
        "case2.js"
      ]
    },
    {
      "matches": [
        "*://*.zerochan.net/*"
      ],
      "js": [
        "common/navigation.js",
        "case3.js"
      ]
    }
  ]
}