SUMMARY On all pages with a 3D secure payment (https://en.wikipedia.org/wiki/3-D_Secure), it fails to load and I cannot validate the transaction. It happened on https://oui.sncf and https://www.lepotcommun.fr STEPS TO REPRODUCE 1. Select a ticket on oui.sncf 2. Enter bank card info from a bank with 3-D secure protection OBSERVED RESULT 3. Blank frame instead of 3D secure UI EXPECTED RESULT 3. 3D secure UI SOFTWARE/OS VERSIONS Linux/KDE Plasma: Falkon 3.1.0, QtWebEngine 5.14.0 ADDITIONAL INFORMATION