BTW, this is a bug in Qt 5.15 added when they they adapted their code to a new chromium version. (It is in their adaption to Chromium 78). The original code only disabled access via the file url scheme (file:///) from within a web page but somehow NOW all local urls are now being translated to be equivalent to file: /// url schemes even if they do NOT explicitly use that url scheme.
So their bug fix changed/broke the meaning of the setting we used. So please do make this change permanent to prevent this nonsense.
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