The following features expose system configuration information and are more harmful than useful in web pages. See #787296 -moz-mac-graphite-theme -moz-mac-lion-theme -moz-maemo-classic -moz-windows-classic -moz-windows-compositor -moz-windows-default-theme -moz-windows-theme -moz-scrollbar-end-backward -moz-scrollbar-end-forward -moz-scrollbar-start-backward -moz-scrollbar-start-forward -moz-scrollbar-thumb-proportional -moz-menubar-drag
Status: UNCONFIRMED → NEW
Ever confirmed: true
Tor browser has a patch for this (at https://gitweb.torproject.org/torbrowser.git/blob/maint-2.2:/src/current-patches/firefox/0010-Limit-device-and-system-specific-CSS-Media-Queries.patch ) - might be a bit too agressive for general usage, but IMHO it wouldn't be hard to extract blocking of Mozilla-specific features outside of Chrome from it...
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