Examine source code of Freename Web3 Extension

{
  "name": "Freename Web3 Extension",
  "version": "3.0.0",
  "description": "Surf in the Web3 using the Freename Plugin! You can enter Web3 domains and navigate to their site.",
  "manifest_version": 2,
  "permissions": [
    "webRequest",
    "<all_urls>",
    "storage",
    "scripting",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Freename Web3 Extension",
    "default_icon": {
      "16": "./assets/img/logo/16x.png",
      "32": "./assets/img/logo/32x.png",
      "48": "./assets/img/logo/48x.png",
      "128": "./assets/img/logo/128x.png"
    }
  },
  "icons": {
    "16": "./assets/img/logo/16x.png",
    "32": "./assets/img/logo/32x.png",
    "48": "./assets/img/logo/48x.png",
    "128": "./assets/img/logo/128x.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3e770c89-c685-496c-94a9-a762de87a29f}"
    }
  }
}