Examine source code of JSON-Tool

{
  "manifest_version": 3,
  "name": "JSON-Tool",
  "description": "A JSON formatting tool.",
  "version": "0.0.8",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "contextMenus",
    "downloads"
  ],
  "action": {},
  "web_accessible_resources": [
    {
      "resources": [
        "json.html",
        "tools.html"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "json-tool@example.com"
    }
  },
  "commands": {
    "open_json_tool": {
      "suggested_key": {
        "windows": "Alt+Shift+J",
        "mac": "Alt+Shift+J"
      },
      "description": "JSON-Tool快捷键",
      "global": false
    },
    "open_dev_tool": {
      "suggested_key": {
        "windows": "Alt+Shift+D",
        "mac": "Alt+Shift+D"
      },
      "description": "Dev-Tool快捷键",
      "global": false
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "<all_urls>",
        "file:///*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}