SELinux

They're not interested in deleting your home directory, but they're
certainly interested in scanning it for what looks like online banking
login details. (Unfortunately, SELinux won't work here, and neither will
anything short of a security system inside the browser itself: because
it's likely that the banking login details must be stored somewhere the
browser can access it, because you'll be getting at the online banking
site through the browser. Doing absolutely everything through the browser
smacks very much of too many eggs in one basket for me.)