Examine source code of Style Scout

{
  "background": {
    "scripts": [
      "jquery-3.2.1.js",
      "config.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon-128.png",
    "default_title": "Style Scout"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*/*"
      ],
      "js": [
        "jquery-3.2.1.js",
        "config.js"
      ],
      "css": [
        "np-style.css"
      ],
      "all_frames": true
    }
  ],
  "name": "Style Scout",
  "short_name": "Style Scout – Fonts & Colors Finder",
  "description": "Fonts & Colors Finder",
  "homepage_url": "https://stylescout.org",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "file:///*/*"
  ],
  "web_accessible_resources": [
    "np-style.css"
  ],
  "version": "0.664resigned1",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{0cb3354d-6268-4925-be99-bf290ad7c305}"
    }
  }
}