Examine source code of Break on Copy

{
  "description": "選択したテキストをショートカットで整形コピーできます",
  "manifest_version": 2,
  "name": "Break on Copy",
  "version": "1.3",
  "homepage_url": "https://lunatic.red",
  "icons": {
    "256": "icons/icon.png"
  },
  "permissions": [
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Break on Copy",
    "default_popup": "options/options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "selcopy.js"
      ],
      "all_frames": true
    }
  ],
  "commands": {
    "seikei_copy": {
      "suggested_key": {
        "default": "F1"
      },
      "description": "選択中のテキストを整形してコピー"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{660841a5-a156-4071-ad5e-8b5b3bca2247}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}