***
If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***

SUMMARY
sites with issues : 
https://www.labanquepostale.fr/particulier/connexion-espace-client.html
https://cloud.lamouette.org/apps/dashboard/
https://www.deepl.com/fr/translator
https://www.service-public.fr/particuliers/vosdroits/F14860/personnalisation/resultat?lang=&quest0=1&quest1=2&quest2=2&quest=
https://www.doctolib.fr/
...

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT
the pages open, but many functions are not working 

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 20.04.6 LTS
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 5.12.8

ADDITIONAL INFORMATION
got Falkon thru Discover