Examine source code of WebNote

{
  "manifest_version": 2,
  "name": "WebNote",
  "description": "Displays a popup where you can add notes for your web pages",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "{05c1d56e-b366-470e-81df-ec8e4c0080a9}",
      "strict_min_version": "54.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/webnote.png",
    "default_title": "Take a Note",
    "default_popup": "popup/panel.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ]
}