Examine source code of Web Developer Lite

{
  "manifest_version": 2,
  "name": "Web Developer Lite",
  "version": "1.0",
  "description": "Minimal AMO-safe Web Developer toolbox: view source, toggle CSS, outline elements, show cookies. No icons included.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Web Developer Lite",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "web-developer-lite@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "content_security_policy": "default-src 'self'; script-src 'self' 'unsafe-eval'; object-src 'self'"
}