I was perusing my favorite online email service just now and saw this red banner blazing across the top of my mail:

My first reaction was “Holy shit they detected Firebug?!?!” My next reaction was “ok, lets see how we fix this”. So I clicked the link. It brought me to this page (included below incase you cannot see the page):
Firebug can make Gmail slow
If you’re using Windows or Linux
For the best Gmail performance, we suggest disabling Firebug for www.google.com 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 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.If you’re using a Mac
Please note that if you’re using a Mac, you’ll continue to experience performance problems unless you disable Firebug for Gmail. To disable Firebug for www.google.com, please follow the steps below:
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.
I am just now disabling Firebug for Gmail… hopefully that will also speed up iGoogle, ’cause it is slower than a snail most of the time on my Powerbook.
Josh Nichols | 30-Oct-07 at 11:43 am | Permalink
Personally, I’ve found it easiest to keep firebug disabled by default, and only turn it on for hosts where I do development.
If something comes up that makes me curious to poke it with firebug, it is simple enough just to turn it on for that host, and the disable it when done.
MikeH | 31-Oct-07 at 5:36 am | Permalink
I was just going to write what Josh said — I keep Firebug off most of the time, and only turn it on when I need it.
Ryan Stille | 16-Nov-07 at 9:13 am | Permalink
I disabled FireBug for gmail the other day when I saw this message. Unfortunately it didn’t seem to speed it up very much. Gmail is pretty darn slow.
Chris Miller | 27-Feb-08 at 4:58 pm | Permalink
Generally I use firefox’s profile manager and only have firebug installed on my development profile. For regular web surfing I use a profile that does not have it installed.