Examine source code of Popmundo Dark Theme

{
  "name": "Popmundo Dark Theme",
  "version": "0.1.1resigned1",
  "manifest_version": 2,
  "description": "Dark theme for browser game Popmundo",
  "icons": {
    "128": "icons/pgray128-on.png"
  },
  "browser_action": {
    "default_icon": "icons/pgray128-on.png",
    "default_title": "Popmundo Dark Theme"
  },
  "options_ui": {
    "page": "src/options/options.html",
    "chrome_style": true
  },
  "permissions": [
    "*://*.popmundo.com/*",
    "storage",
    "tabs",
    "webNavigation"
  ],
  "background": {
    "page": "src/background.html",
    "persistent": true
  },
  "web_accessible_resources": [
    "/src/inject/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ecee5c6-415e-4661-9258-399dd76a1fd5}"
    }
  }
}