Examine source code of ReSkin for Discord

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.0.3",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "web_accessible_resources": [
    {
      "resources": [
        "masks/*.html"
      ],
      "matches": [
        "*://discord.com/*"
      ]
    }
  ],
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "discordreskin@nitrofun.eu"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://discord.com/*"
      ],
      "css": [
        "content-scripts/config.css",
        "content-scripts/masks.css"
      ],
      "js": [
        "content-scripts/config.js",
        "content-scripts/masks.js"
      ]
    }
  ]
}