Examine source code of Sticky Notes on Web

{
  "manifest_version": 2,
  "name": "Sticky Notes on Web",
  "version": "1.0",
  "description": "Add sticky notes to any webpage and save them for later.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{677a9d86-8bde-435d-93ba-5c9ffb44f7c2}"
    }
  }
}