Examine source code of Github Assistant

{
  "description": "Adds a browser GitHub action icon to the toolbar.",
  "manifest_version": 2,
  "name": "GitHub Assistant",
  "version": "0.3.0",
  "icons": {
    "40": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "theme_icons": [
      {
        "light": "icons/icon.png",
        "dark": "icons/icon.png",
        "size": 40
      }
    ],
    "default_title": "GitHub Assistant",
    "default_popup": "popup/index.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "content_scripts/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "github-assistat@pawel.swiszcz",
      "strict_min_version": "57.0a1"
    }
  }
}