Examine source code of BoxnovelEnlarge

{
  "description": "Adds an adds an additional page on boxnovel.com",
  "manifest_version": 2,
  "name": "BoxnovelEnlarge",
  "version": "1.0",
  "homepage_url": "about:blank",
  "content_scripts": [
    {
      "matches": [
        "*://boxnovel.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2173cb25-ecc3-49d6-9ee3-96a753e99809}"
    }
  }
}