Examine source code of Regex Extractor

{
  "manifest_version": 2,
  "name": "Regex Extractor",
  "version": "1.3",
  "description": "Extracts text from webpages using custom regex patterns and copies them to the clipboard. Features a toggleable hotkey (Ctrl+Shift+Space), context menus, and regex management.",
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "contextMenus",
    "storage"
  ],
  "browser_action": {
    "default_title": "Copy Regex Matches"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "homepage_url": "https://github.com/coolmagnet/Regex-Extractor",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1b2c3d4-e5f6-7890-abcd-1234567890ef}"
    }
  },
  "commands": {
    "toggle-extension": {
      "suggested_key": {
        "default": "Ctrl+Shift+Space"
      },
      "description": "Toggle regex extractor extension"
    }
  }
}