Examine source code of CleanText Extractor

{
  "manifest_version": 2,
  "name": "CleanText Extractor",
  "version": "1.0",
  "description": "Extract clean text from web pages by removing HTML and formatting",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "CleanText Extractor",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{461d81a4-246a-4f97-afd0-e514980dc96e}"
    }
  }
}