Examine source code of FAU Toolbox

{
  "manifest_version": 2,
  "version": "4",
  "name": "FAU Toolbox",
  "description": "Displays the FAU Toolbox from tools.fau-leipzig.de",
  "homepage_url": "https://tools.fau-leipzig.de",
  "browser_action": {
    "default_icon": "icon128x128.png",
    "default_title": "FAU Toolbox",
    "default_popup": "display_toolbox.html"
  },
  "icons": {
    "32": "icon32x32.png",
    "64": "icon64x64.png",
    "128": "icon128x128.png"
  }
}