Examine source code of Spreadder

{
  "manifest_version": 2,
  "name": "Spreadder",
  "version": "1.0",
  "applications": {
    "gecko": {
      "id": "spreadder@ionllc.rf.gd"
    }
  },
  "icons": {
    "48": "spreadder.png"
  },
  "browser_action": {
    "default_title": "Spreadder",
    "default_popup": "popup.html"
  }
}