Examine source code of Note Ease

{
  "manifest_version": 2,
  "name": "Note Ease",
  "version": "1.0",
  "description": "Write and save notes",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/popup.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "/icons/notes-icon.svg"
    },
    "default_title": "Note Ease"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5bed6aee-2ae2-4914-b439-e9461c7edc45}"
    }
  }
}