Examine source code of TBD True Dark

{
  "manifest_version": 2,
  "name": "TBD True Dark",
  "version": "1.0.1",
  "description": "Modifies TorrentBD to use true dark base color and a red accent color. Script Courtesy: NaeemBolchhi ",
  "icons": {
    "48": "icons/tbd-true-dark-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.torrentbd.net/*",
        "*://*.torrentbd.com/*",
        "*://*.torrentbd.me/*"
      ],
      "js": [
        "tbdtruedark.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/tbd-true-dark-48.png"
  }
}