For the best Gmail performance, we suggest disabling Firebug for www.google.com. Windows or Linux Users To disable Firebug: Click the green or red icon in the bottom right corner of the browser window to open Firebug. Click the bug icon in the top left corner of Firebug and select 'Disable Firebug for mail.google.com.' If you'd like to keep Firebug running, you may improve Gmail performance by fol