Examine source code of ModHub Dark Theme

{
  "manifest_version": 2,
  "name": "ModHub Dark Theme",
  "version": "1.0.0.1",
  "description": "Changes the theme to dark on farming-simulator.com",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "permissions": [
    "https://www.farming-simulator.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.farming-simulator.com/*"
      ],
      "js": [
        "homepage.js",
        "mods.js",
        "blog.js",
        "info.js",
        "info2.js",
        "dlc.js",
        "buy.js",
        "updates.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2819d7e1-de5a-421a-ba11-feae6ac2a65d}"
    }
  }
}