mozilla Disable official Firefox branding (icons, name) which are not binary-redistributable according to upstream. Fine-tune custom compiler optimizations (-Os, -O0, -O1, -O2, -O3) Allow Gecko Media Plugins (binary blobs) to be automatically downloaded and kept up-to-date in user profiles 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 x11-libs/cairo instead of bundled. Use the system-wide dev-libs/icu instead of bundled. Use the system-wide media-libs/libjpeg-turbo instead of bundled. Use the system-wide media-libs/libvpx instead of bundled. Use the system-wide dev-db/sqlite installation with secure-delete enabled Support HTML5 WebM with media-libs/libvpx on firefox-10.