I\'m trying to get FireBug Lite working with IE7. Given this code (and nothing else):
One possible cause of this: if there's no stylesheet or CSS style data. No idea why.
If there is no CSS and you're seeing this error, add some and Firebug Lite might just work again.
For example, this JSbin, with a token CSS rule, works with Firebug Lite in IE8:
Code: http://jsbin.com/etecub/5/edit
This JSbin, identical but with no CSS rules, fails to load Firebug Lite in IE8 with the error 'this.messageQueue' is null or not an object:
Code: http://jsbin.com/etecub/6/edit
It seems like it doesn't matter if the rule is actually applied or not (e.g. http://jsbin.com/etecub/9 works fine). If you've got a stylesheet attached and see this error anyway, and the above doesn't work, maybe try adding a block to the document with a CSS rule or two.