Examine source code of Auto Contrast Mode

{
  "manifest_version": 2,
  "name": "Auto Contrast Mode",
  "version": "1.0",
  "description": "Detects ambient light levels and adjusts website contrast automatically.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec63830b-aeda-4a23-8b15-4c908d77b2e9}"
    }
  }
}