mozilla Disable official Firefox branding (icons, name) which are not binary-redistributable according to upstream. Fine-tune custom compiler optimizations, setting this is not recommended. Enable crashreporter for mozilla upstream, debugging symbols are not required for reporting crashes. Use inter-process communication between tabs and plugins. Allows for greater stability in case of plugin crashes Prevent sdk and headers from being installed Add support for profile-guided optimization using gcc-4.5, for faster binaries. This option will double the compile time. Use the system-wide dev-db/sqlite installation with secure-delete enabled Use system media-libs/libvpx for HTML5 WebM video support.