Examine source code of trot.to

{
  "manifest_version": 2,
  "name": "tro.to",
  "description": "Enable 'go' links for tro.to accounts",
  "version": "0.1",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://go/*",
    "*://*.trot.to/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.trot.to/*"
      ],
      "js": [
        "data_injector.js"
      ],
      "run_at": "document_start"
    }
  ],
  "applications": {
    "gecko": {
      "id": "trotto@example.com"
    }
  }
}