I have been trying to get FirePHP to work for an hour now. I have the latest firebug installed and it works fine. I also installed the FirePHP addon. Then I downloaded the library files and included them in my php file. I am sure that they are being included. Now I started FirePHP with the ob_start();
statement. Then I tried logging something with fb('Log message', FirePHP::LOG);
but nothing showed up on the console. I have tried looking in the Net Panel, The Console window, had All checked, tried using the OOP method, etc. but nothing is working. I can see headers being sent just fine but I cannot see any logged messages. What gives?

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What versions of each are you using? For a while, only the latest RC of the next version actually worked with modern Firebug versions. I'm not sure if they fixed this yet. – Charles Mar 12 '11 at 23:04
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Any luck with this? I've been having the same problems. I can even get the header already sent error, but I still can't manage to see anything in the console. – rhololkeolke Aug 02 '11 at 02:44
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Restarting Firefox is sometimes necessary. – Heikki Naski May 10 '11 at 05:06
2 Answers
I have had the same problem a number of times. One of the following 'fixes' worked for me in the past.
- Mismatch between server lib and client plugin, that is my fault.
- Newer version of firebug being installed and not compatible with firephp plugin
- Restarting firefox
- Making sure that both the console and net tabs are enabled.
- Look at the headers being sent in the inspector, make sure there are headers like X-Wf-1-1-1-2

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`Making sure that both the console and net tabs are enabled` was the issue for me – dKen Oct 22 '15 at 13:43
I had the same problem. Installed everything as mentionned in the installation walkthrough.
I was using Symfony 2.2. First, you must know that when using the file there is a Symfony plugin that can be found at : http://www.symfony-project.org/plugins/sfFirePHPPlugin
look at the readme to know how to install it.
Second, I also had a problem with Monolog's FirePHP handler in my config where it was bugging FirePHP Add-On in Firefox thus preventing the information from showing. I used the configuration where all the Info level errors were sent to FirePHP in config_dev file. Once removed from the configs, the previous FirePHP events started showing in the FirePHP Add-On on Firefox.
Hope this helps a couple of you guys :)

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