With the new Gmail 2.0 recently launched, many noticed that it slow down Firefox considerably to make it crash. The Gmail team quickly investigated and found that the problem is due to Firebug, ultimate debugger tool for Firefox. Google suggest to disable Firebug or change its setting by stop showing XMLHttpRequests and disable the Network Monitoring if you still need it enabled. But certainly this concern mainly developers who usually uses Firebug with Firefox to debug and monitor client-side bugs.
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.
