Examine source code of Automatic tab sorting

{
  "manifest_version": 3,
  "name": "Automatic Tab Sorting",
  "version": "2.4.2",
  "description": "Moves the active tab to the first unpinned position. Most recently used tabs always stay first.",
  "author": "Gildas Le Drogoff",
  "homepage_url": "https://github.com/gildas-le-drogoff/active-tab-sorting-firefox",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "TabSort",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "tabs",
    "tabGroups",
    "storage",
    "alarms",
    "sessions"
  ],
  "commands": {
    "extract-domain-window": {
      "suggested_key": {
        "default": "Alt+Shift+W"
      },
      "description": "Extract domain to new window"
    },
    "extract-domain-group": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Extract domain to new tabs group"
    },
    "sort-title": {
      "description": "Sort ungrouped tabs by title"
    },
    "sort-domain": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Sort ungrouped tabs by domain"
    },
    "group-all": {
      "suggested_key": {
        "default": "Alt+Shift+G"
      },
      "description": "Group all tabs by domain"
    },
    "close-group": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      },
      "description": "Close all tabs in current group"
    },
    "remove-duplicates": {
      "suggested_key": {
        "default": "Alt+Shift+R"
      },
      "description": "Remove duplicate tabs (same URL)"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/circle-sort.svg",
    "128": "images/icon-128.png",
    "256": "images/icon-256.png",
    "512": "images/icon-512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2788fd60-04b0-4a8f-8605-3562e3396216}",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}