Update (after 1 hour): Issue fixed in v7.3.4, it's live now. Thank you for letting me know, so that I am able to fix it in time for everybody. P.S. interestingly the same logic doesn't break on Chrome, only on Firefox somehow some web pages are more sensitive to webcomponent...

Would you mind to update to the newest version, and try it again?

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Ouch, critique's accepted. I see how the dilemma goes, it even breaks the login page at our community website... I will fix it ASAP.