Examine source code of CopyTool

{
  "manifest_version": 2,
  "name": "CopyTool",
  "version": "1.2.1",
  "description": "",
  "icon": "icon.png",
  "permissions": [
    "activeTab",
    "clipboardRead",
    "clipboardWrite",
    "tabs"
  ],
  "sidebar_action": {
    "default_panel": "sidebar.html",
    "browser_style": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{59996722-484e-42c6-a322-10994d977bfa}"
    }
  }
}