mozilla Fine-tune custom compiler optimizations 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 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 libvpx media-libs/libvpx