I answer to myself; just googling a little I found this (not jQuery)
solution (http://groups.google.com/group/firebug/msg/c5368294b82baad1)
pere roca wrote:
>
>
> hi all,
> I have an application that fails when Firebug is installed in Firefox 3
> (with FF2 works). does someone know any way to detect if Firebug is
> installed (I know how to detect FF, but not Firebug)
>
> thanks!
> --------
>
> Pere Roca Ristol
> BiĆ²leg i especialista GIS
> Museo Nacional de Ciencias Naturales (CSIC)
> Visita l'EDIT mapViewer!
> http://edit.csic.es/edit_geo/prototype/edit.html
>
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