Examine source code of Tabless

{
  "manifest_version": 3,
  "name": "Tabless",
  "version": "1.9.4",
  "permissions": [
    "declarativeNetRequest",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "./custom_page/custom_page.html"
  },
  "chrome_settings_overrides": {
    "homepage": "./custom_page/custom_page.html"
  },
  "icons": {
    "16": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hall_of_iFrame@uxer"
    }
  },
  "commands": {
    "_execute_action": {},
    "star_group": {
      "description": "Star"
    },
    "sailing_group": {
      "description": "Sailing"
    },
    "flower_group": {
      "description": "Flower"
    },
    "coffee_group": {
      "description": "Coffee"
    }
  },
  "action": {}
}