Examine source code of Curse Highlight

{
  "manifest_version": 2,
  "name": "Curse Highlight",
  "version": "1.1resigned1",
  "description": "Highlights curse words on lyrics websites.",
  "icons": {
    "48": "icons/curse_2.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.azlyrics.com/*",
        "*://*.songlyrics.com/*",
        "*://*.lyricsfreak.com/*",
        "*://*.metrolyrics.com/*",
        "*://*.lyricsmode.com/*"
      ],
      "js": [
        "mark.min.js",
        "curse.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4e58d85-802f-49fa-a5cf-987359335178}"
    }
  }
}