Examine source code of BYOBeautiful

{
  "manifest_version": 2,
  "name": "BYOBeautiful",
  "version": "0.3.1resigned1",
  "permissions": [
    "https://forums.somethingawful.com/",
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://forums.somethingawful.com/*"
      ],
      "css": [
        "src/more-byob.css"
      ]
    }
  ],
  "page_action": {
    "default_popup": "src/popup.html"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6a951e9-5f82-429b-87c9-95e9dc1f3df5}"
    }
  }
}