If you guys have Firebug installed in your Firefox browser, hmm…. then it can make Gmail slow. For the better performance Gmail team is suggesting us to disable Firebug for www.google.com . Even they have given some instructions to how we can disable Firebug. Below content courtesy “Gmail” Windows or Linux Users To disable Firebug:

1. Click the green or red icon in the bottom right corner of the browser window to open Firebug.
2. 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 following these steps:

1. Click the green or red icon in the bottom right corner of the browser window to open Firebug.
2. Click the Console tab.
3. Select Options.
4. Uncheck Show XMLHttpRequests.
5. Click the Net tab.
6. Select Options.
7. Check Disable Network Monitoring.

Mac Users To disable Firebug:

1. Click the green or red icon in the bottom right corner of the browser window to open Firebug…
2. Click the bug icon in the top left corner of Firebug and select ‘Disable Firebug for mail.google.com .’

If disabling Firebug for Gmail doesn’t improve performance results, you may have to entirely disable Firebug. Make sure the above things were taken care properly…… Hope this information helps everyone…