Examine source code of Superposition helper

{
  "name": "Superposition helper",
  "version": "1.0.1",
  "manifest_version": 2,
  "description": "Open the current page in Superposition and export its design tokens to code and design tools",
  "homepage_url": "https://superposition.design",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "src/open.js"
    ],
    "persistent": true
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "contextMenus"
  ],
  "browser_action": {
    "default_icon": "icons/icon19.png",
    "default_title": "Open in Superposition"
  }
}