Examine source code of Async Render Toolbox

{
  "name": "async render toolbox",
  "short_name": "Async Render",
  "version": "0.2.2resigned1",
  "description": "Open source tools to debug your async render apps. Click on the icon to see the lag radar, ⌥+R to show/hide",
  "permissions": [
    "activeTab",
    "declarativeContent",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "Async Render Toolbox"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_page": "options.html",
  "homepage_url": "https://github.com/sw-yx/async-render-toolbox",
  "incognito": "spanning",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "{c6988e4e-86ea-4866-ad75-700bddaefc66}"
    }
  }
}