This profiler instance was unable to connect to the WebChannel. This usually means that it’s running on a different host from the one that is specified in the preference <code>devtools.performance.recording.ui-base-url</code>. If you would like to capture new profiles with this instance, and give it programmatic control of the profiler menu button, you can go to <code>about:config</code> and change the preference.
此分析器无法连接至 WebChannel。通常是因为运行分析器的主机与 <code>devtools.performance.recording.ui-base-url</code> 首选项中指定的主机不同。若您想要使用此分析器捕捉新的性能分析记录，并可程序化控制分析器菜单按钮，可到 <code>about:config</code> 调整该首选项。