Examine source code of Protractor

{
  "action": {
    "default_title": "Protractor"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "description": "Easily measure angles in your browser window.",
  "icons": {
    "16": "images/icon16-on.png",
    "48": "images/icon48-on.png",
    "128": "images/icon128-on.png"
  },
  "manifest_version": 3,
  "name": "Protractor",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "short_name": "Protractor",
  "version": "4.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{74af7994-19a4-11f0-8975-074fcc03d43a}",
      "strict_min_version": "110.0"
    }
  },
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "images/sprite-buttons.svg"
      ]
    }
  ]
}