Examine source code of MagicLink

{
  "manifest_version": 2,
  "name": "MagicLink",
  "version": "1.0",
  "description": "Query Magnet and ED2K links on the current page",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0f78b7c-6d27-48cf-941f-8c8a409448e8}"
    }
  }
}