Examine source code of Roblox Logo Changer

{
  "manifest_version": 3,
  "name": "Roblox Logo Changer",
  "version": "1.2",
  "description": "Replaces the Roblox logo with a custom image.",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.roblox.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {},
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "logo-changer@example.com"
    }
  }
}