Anyway, the other way around? Does this mean you need to start eclipse, start a debugging session there with Firebug turned on?
If this may be the answer, see the explanation in Installing a JavaScript device to remove Aptana Studio . It is possible to install Aptana inside eclipse instead of downloading everything.
Caution: I have never tried this, but I am currently using Aptana to program Rails, perhaps I will use this in the near future.
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