Alternate browser outside a browser-specific rule
How common it is: not established.
Detection
A permitted alternate browser shows use while the browser to which site restrictions were applied shows little or none.
Fix (technical)
Restrict unauthorized app installation/availability as well as configuring web policy. Google Family Link documents Chrome-specific site controls, so do not generalize a Chrome control to every third-…
Fix (relational)
If an alternate browser is wanted for privacy, accessibility or school compatibility, agree on an allowed browser rather than turning browser choice itself into the conflict.
Residual risk
In-app web views and browser engines can differ by platform and OS version.
Sources
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google-familylink-supervision
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apple-parental-controls-en