Hi Chris,
I am having the same kind of problem with Symfony 1.0.18 and Firefox
3.0.3 (Debian)
My login page far simple works like a charm while other pages, having
more javascript and css inclusions fails to send data to firesymfony.
Looking the html shows the FireSymfonyDebugData js var.
Playing with my current layout and view, I removed all decoration
stuff with no more success.
Then removing the remaining empty <head> tag, firesymfony logging went
back.
Hope this will help in resolving this issue.
Regards,
Youx