Examine source code of vxTwitter Paste

{
  "manifest_version": 3,
  "name": "vxTwitter Paste",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "vxtwitter-paste@ishyume",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Paste x.com links as vxtwitter.com links with Alt+V",
  "permissions": [
    "clipboardRead",
    "clipboardWrite",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "vxTwitter Paste",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "commands": {
    "paste-vx-link": {
      "suggested_key": {
        "default": "Ctrl+Q"
      },
      "description": "Paste clipboard URL as vxtwitter link"
    },
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+V"
      },
      "description": "Open vxTwitter Paste popup"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png"
  }
}