Examine source code of Quick Notes on Tabs

{
  "manifest_version": 2,
  "name": "Quick Notes on Tabs",
  "version": "1.0",
  "description": "Adds a small, persistent sticky note to each tab where users can jot down quick notes related to the content of the page.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9e3723dd-d131-4088-bec8-54692299793e}"
    }
  }
}