Examine source code of ProblemGen

{
  "manifest_version": 2,
  "name": "ProblemGen",
  "version": "1.0",
  "description": "Generate math problems in order with a specific index.",
  "homepage_url": "https://ntdi.world",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "ProblemGen",
    "default_popup": "popup/generate.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5691426a-f92e-4ba2-bee4-0d7041741861}"
    }
  }
}