Examine source code of Send Selection To Notes

{
  "manifest_version": 2,
  "name": "Send Selection To Notes",
  "version": "1.3",
  "default_locale": "en",
  "description": "Send selection to notes or make notes manually.",
  "icons": {
    "48": "icons/logo_48x48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "send-selection-to-notes@roge.de"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "downloads",
    "menus"
  ],
  "background": {
    "page": "background/background-page.html"
  },
  "browser_action": {
    "default_icon": "icons/logo_32x32.png",
    "default_title": "Make notes",
    "default_popup": "popup/notes.html"
  }
}