Examine source code of Note Solver

{
  "manifest_version": 2,
  "name": "Note Solver",
  "version": "1.0",
  "description": "A simple extension to save notes and act as small calculator.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62eaeb9c-eee8-4982-b3db-5debeb1123f8}"
    }
  }
}