Examine source code of Cyber Score

{
  "browser_action": {
    "browser_style": true,
    "default_title": "Cyber Score",
    "default_popup": "main.html"
  },
  "description": "Cyber Score simple API for website",
  "homepage_url": "https://github.com/cyber-score",
  "manifest_version": 2,
  "name": "Cyber Score",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "64": "./icon.png"
  },
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{91457eaf-737c-4679-b5a2-f478d2198c15}"
    }
  }
}