Examine source code of supertools-browser-toolkit

{
  "manifest_version": 2,
  "name": "SuperTools - All-In-One Browser Toolkit",
  "version": "2.0.0",
  "version_name": "2.0.0",
  "description": "20+ browser tools in one extension. Calculator, Converter, Color Picker, JSON, Dark Mode, Password Gen & more. 100% offline.",
  "author": "SuperTools Team",
  "homepage_url": "https://github.com/supertools-addon/supertools",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "supertools@addon",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "clipboardWrite",
    "clipboardRead",
    "notifications",
    "contextMenus",
    "tabs"
  ],
  "web_accessible_resources": [
    "icons/*.png",
    "popup/qrcode.min.js"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-48.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "SuperTools - All-In-One Toolkit",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle"
    }
  ]
}