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Does Firefox on Linux needs capability CAP_SYS_ADMIN to work properly?

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I'm using AppArmor on my system (Gentoo, vanilla kernel 4.9). I discovered that every time Firefox starts is trying to get very powerful CAP_SYS_ADMIN capability. Does Firefox drop this capability before process handles external data/access internet? Does denying this capability have any negative consequences? EDIT: I just found out Firefox is using this capabilities to sandbox itself. Its great but default AppArmor policies like will deny CAP_SYS_ADMIN. Does Mozilla have any communication channels with major distributions or should i file bug reports myself?

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A search on the DXR website and on Bugzilla could indicate that this is sandbox related.