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Starting Brave browser (on linux manjaro) shows a
“You are using an unsupported command-line flag: --no-sandbox. Stability and security will suffer.” message.

Reading the support forums it seems that one needs to enable user namespaces to get rid of the message. Brave Support Forum

Questions:
1) What are these "stability and security" risks I'm facing if I ignore the message?
2) Does enabling user namespaces to remove these stability and security risks come with any other security risks?

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    Regarding your second question, yes, but there's not much you can do about it without using a custom kernel or tweaking sysctl settings. User namespaces, if unprivileged, make privesc vulnerabilities far easier to exploit. – forest Apr 15 '19 at 8:34

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