class Selenium::WebDriver::Firefox::Extension

def write_to(extensions_dir)
  root_dir = create_root
  ext_path = File.join extensions_dir, read_id(root_dir)
  FileUtils.rm_rf ext_path
  FileUtils.mkdir_p File.dirname(ext_path), mode: 0o700
  FileUtils.cp_r root_dir, ext_path
  FileReaper.reap(root_dir) if @should_reap_root
end