Examine source code of GG.deals Button

{
  "manifest_version": 3,
  "name": "GG.deals-Button",
  "short_name": "GG-Button",
  "author": "Archer",
  "description": "Adds a button to SteamDB and Steam Store pages to open games on GG.deals",
  "version": "2.4.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4a0e6b1-8c3a-4f2d-9e1a-7b5c2d8f3a4e}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://gg.deals/*",
        "https://steamdb.info/app/*",
        "https://store.steampowered.com/app/*",
        "https://www.gog.com/*"
      ],
      "js": [
        "src/utils.js",
        "src/content_script.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "64": "icons/icon64.png",
      "128": "icons/icon128.png"
    },
    "default_title": "GG.deals-Button",
    "default_popup": "popup/pop_settings.html"
  },
  "permissions": [
    "storage"
  ]
}