Examine source code of ChainTab

{
  "manifest_version": 3,
  "name": "ChainTab",
  "version": "1.1",
  "description": "Display cryptocurrency and blockchain news and updates",
  "browser_specific_settings": {
    "gecko": {
      "id": "{659361f7-353a-4174-bf58-8f78616938d0}"
    }
  },
  "action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage",
    "topSites"
  ]
}