Examine source code of Clean And Copy Selection

{
  "manifest_version": 2,
  "name": "Clean And Copy Selection",
  "version": "1.1",
  "default_locale": "en",
  "description": "Copy selection to clipboard without some special characters",
  "icons": {
    "48": "icons/logo_48x48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "clean-and-copy-selection@roge.de"
    }
  },
  "permissions": [
    "activeTab",
    "menus",
    "clipboardWrite"
  ],
  "background": {
    "page": "background/background-page.html"
  },
  "browser_action": {
    "default_icon": "icons/logo_32x32.png",
    "default_title": "Clean and copy selection [Ctrl+Shift+Q]"
  },
  "commands": {
    "command-clean-and-copy-selection": {
      "suggested_key": {
        "default": "Ctrl+Shift+Q",
        "linux": "Ctrl+Shift+Q"
      },
      "description": "Clean and copy selection"
    }
  }
}