GBWhatsApp is a modified version of WhatsApp that includes a built-in DP viewer. It allows you to view and download any profile picture, even those set to high privacy. However, using modded WhatsApp versions violates WhatsApp’s terms and can lead to a temporary or permanent ban of your phone number.
Chrome extensions like "WA Web Plus" add a "Download DP" button directly to WhatsApp Web. This is the safest method because it doesn't modify your phone app. Whatsapp Dp Viewer