Firebug can make Gmail slow

If you have FireBug installed in FireFox and you've been experiencing slow response from Gmail lately, you might find the following interesting.

I just fired up my FireFox first thing this morning, went to Gmail and got the following message in alarming red:

I clicked the "Fix It" link and received detailed instructions on configuring FireBug not to "interfere" with Gmail, which I followed (just disabled FireBug for mail.google.com)

Now that's good service!