Examine source code of TODO

{
  "name": "TODO",
  "description": "Just simple TODO",
  "icons": {
    "128": "icon.png"
  },
  "version": "1.1.0",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23b65ce7-a77c-40ed-90ff-55b05551b0b3}"
    }
  }
}