Examine source code of LocalSync

{
  "manifest_version": 2,
  "name": "LocalSync",
  "version": "1.0",
  "description": "Store and manage tracking data locally within your browser.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a4624a3-b1ed-428c-b788-acf7e0833c1b}"
    }
  }
}