Admin product filter by Category and Manufacturer
OCMod
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Based on multiple extensions from 1.5.6...
The extension will add filters to the Admin/Product List
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SIDE EFFECT:
forgot to tell:
i hink it's not smart idea with 'quantity' filter in admin. there is no reason to filter with exact value
you can specify < 12 12 or >= 12 and you well see the product meeting this criteria