Examine source code of Dimtime

{
  "manifest_version": 2,
  "name": "Dimtime",
  "version": "1.0",
  "author": "Bartosz Wiorek",
  "description": "Dim page for better browsing experience at night time.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e5d9ce4d-c88c-4971-a147-8cbcc8a6938e}"
    }
  }
}