It looks to me from googling that the chemicals in the D-76 developer are not extremely dangerous in trace amounts. They are chemicals that seem to be oxidizing/bleaching things including borax and hydroquinone.
So, basically, a just little more wierd than regular bleach materials. To clean up the kitchen, I would thouroghly wash everything with soap/water. Multiple passes will help - 3 complete washes of all surfaces is better than 1, because each wash you have exponentially less of the substance there.
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