Looks like a font color problem, try
http://getfirebug.com/wiki/index.php/I_found_a_Firebug_Bug!#Cannot_Open_or_Mysterious_Problems:_Create_a_New_Firefox_Profile

jjb


On Mar 25, 9:56 am, Sarah Fleming <[email protected]> wrote:
> Using Firefox 4.0
> Firebug 1.7.0
>
> When I open Firebug, it is blank. The <!DOCTYPE html PUBLIC "-//W3C//
> DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/
> xhtml1-transitional.dtd"> and - + symbols appear, but no text.
>
> All addons have been disabled except for Firebug.
>
> Screenshot:https://picasaweb.google.com/lh/photo/cKKJk13_w5QAIiaZcpxWfg?feat=dir...
>
> I have done all the standard troubleshooting, uninstalled,
> reinstalled, rebooted. Any other suggestions?

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