Examine source code of Flame Boys

{
  "browser_action": {
    "default_popup": "p.html",
    "default_title": "Flame Boys 🔥"
  },
  "description": "Easily paste special symbols into any text field.",
  "developer": {
    "name": "Semantic.Moscow"
  },
  "homepage_url": "https://semantic.moscow",
  "icons": {
    "16": "16x16.png",
    "32": "32x32.png",
    "48": "48x48.png",
    "64": "64x64.png",
    "128": "128x128.png"
  },
  "manifest_version": 2,
  "name": "Flame Boys",
  "permissions": [
    "clipboardWrite",
    "tabs"
  ],
  "short_name": "Flame Boys 🔥",
  "version": "1.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2315b519-145a-4e94-b4b5-9d6df0e0b502}"
    }
  }
}