Examine source code of NationTweaker

{
  "manifest_version": 2,
  "name": "NationTweaker",
  "version": "0.3resigned1",
  "description": "Tweaks, fixes, and enhancements for NationBuilder",
  "applications": {
    "gecko": {
      "id": "nationtweaker@effy.is"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.nationbuilder.com/*"
      ],
      "js": [
        "nationtweaker.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "options_ui": {
    "page": "nationtweaker_settings.html"
  },
  "web_accessible_resources": [
    "nationtweaker_settings.html",
    "css/*.css"
  ]
}