Examine source code of Smart Text Copier

{
  "manifest_version": 2,
  "name": "Smart Text Copier",
  "version": "2.0",
  "description": "Copy selected text with trimming, formatting, transformations, and notifications",
  "browser_specific_settings": {
    "gecko": {
      "id": "smart-text-copier@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [],
        "collected": false,
        "data": []
      }
    }
  },
  "permissions": [
    "clipboardWrite",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}