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manifest.json
{
  "manifest_version": 2,
  "name": "switchTab",
  "version": "1.0",
  "description": "Switch tabs with Ctrl + Numkeys",
  "permissions": [
    "tabs",
    "scripting"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "match_about_blank": true,
      "run_at": "document_start",
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f06584bf-f6de-422d-bf50-b0998c7cd511}"
    }
  }
}