Examine source code of Ephemeral Notes

{
  "manifest_version": 2,
  "name": "Ephemeral Notes",
  "version": "1.0",
  "description": "Quick, temporary sticky notes for any web page. Notes disappear automatically when the tab is closed.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Ephemeral Notes"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+E",
        "mac": "MacCtrl+Shift+E"
      },
      "description": "Toggle Ephemeral Notes"
    }
  },
  "web_accessible_resources": [
    "note.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{244a2255-bb44-401b-98cf-5624de6b3e3a}"
    }
  }
}