Open the \Documents\Fritzing\bins\AdaFruit.fzb file in a text editor, on the second line, replace icon=“Custom1.png” with icon=“AdaFruit.png”, save and restart Fritzing. 
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Open the \Documents\Fritzing\bins\AdaFruit.fzb file in a text editor, on the second line, replace icon=“Custom1.png” with icon=“AdaFruit.png”, save and restart Fritzing.