This extension is a personal follow-up reminder assistant for WhatsApp Web. It does not collect or transmit any data — everything is stored locally in the user's own browser. The optional backup uses the browser's own sync storage (the user's own account); no data reaches the developer or any third party.

The code is plain, unminified JavaScript with no build step, bundler, or minifier. No source code submission should be required.

Regarding the innerHTML warnings from the validator: all dynamic values inserted into the UI are escaped first (see the esc() function in dashboard.js and popup.js). No unsanitized user input is written to innerHTML.

To test: install the add-on, open web.whatsapp.com and log in, open any conversation, then click the green "Follow-up" button in the chat header. The contact's name and number are captured automatically. Enter a message, choose "Once", and save. It appears in the dashboard.

This is an independent tool and is not affiliated with WhatsApp or Meta.