Examine source code of Ctrl Alt Arrow tab switcher

{
  "name": "Ctrl Alt Arrow tab switcher",
  "description": "Switch (or move) tabs with Ctrl + Alt (+ Shift) + Arrow keys",
  "version": "1.0",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "90.0",
      "id": "ctrl-alt-arrow-tab-switcher-@rakennus",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "tab-left": {
      "suggested_key": {
        "default": "Ctrl+Alt+Left"
      },
      "description": "Switch to the left tab"
    },
    "tab-right": {
      "suggested_key": {
        "default": "Ctrl+Alt+Right"
      },
      "description": "Switch to the right tab"
    },
    "move-tab-left": {
      "suggested_key": {
        "default": "Alt+Shift+Left"
      },
      "description": "Move current tab to the left"
    },
    "move-tab-right": {
      "suggested_key": {
        "default": "Alt+Shift+Right"
      },
      "description": "Move current tab to the right"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ]
}