Examine source code of Bongo Cat

{
  "manifest_version": 3,
  "name": "bongo-cat",
  "version": "1.0",
  "description": "🐱🥁",
  "action": {
    "default_popup": "popup/cat.html"
  },
  "icons": {
    "48": "icon@48.png",
    "128": "icon@128.png",
    "530": "icon@530.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sleepingforge@gmail.com",
      "strict_min_version": "58.0"
    },
    "gecko_android": {
      "id": "sleepingforge@gmail.com",
      "strict_min_version": "58.0"
    }
  }
}