Google Chrome extension to capture WhatsApp web messages
Location where the captured messages are saved
C:\Users\[seu usuário]\AppData\Local\Google\Chrome\User Data\[seu profile do google chrome]\databases\https_web.whatsapp.com_0
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Visit chrome://extensions (via omnibox or menu -> Tools -> Extensions).
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Enable Developer mode by ticking the checkbox in the upper-right corner.
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Click on the "Load unpacked extension..." button.
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Select the directory containing your unpacked extension.