After emerge -C dev-libs/nss: >>> Unmerging (1 of 1) dev-libs/nss-3.29.5... >>> needed obj /usr/lib64/libnss3.so >>> needed obj /usr/lib64/libnssutil3.so >>> needed obj /usr/lib64/libsmime3.so >>> needed obj /usr/lib64/libssl3.so * abi_x86_64.amd64: running multilib_pkg_postrm !!! existing preserved libs: >>> package: dev-libs/nss-3.29.5 * - /usr/lib64/libnssutil3.so * used by /opt/firefox/libfreeblpriv3.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/libnss3.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/libnssdbm3.so (www-client/firefox-bin-52.3.0) * used by 5 other files * - /usr/lib64/libnss3.so * used by /opt/firefox/libsmime3.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/libssl3.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/libxul.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/updater (www-client/firefox-bin-52.3.0) * - /usr/lib64/libsmime3.so * used by /opt/firefox/libxul.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/updater (www-client/firefox-bin-52.3.0) * - /usr/lib64/libssl3.so * used by /opt/firefox/libxul.so (www-client/firefox-bin-52.3.0) * used by /opt/firefox/updater (www-client/firefox-bin-52.3.0) Use emerge @preserved-rebuild to rebuild packages using these libraries [ebuild R ] www-client/firefox-bin-52.3.0::gentoo USE="ffmpeg startup-notification -pulseaudio (-selinux)" L10N="en-GB -ach -af -an -ar -as -ast -az -bg -bn-BD -bn-IN -br -bs -ca -cs -cy -da -de -el -en-ZA -eo -es-AR -es-CL -es-ES -es-MX -et -eu -fa -fi -fr -fy -ga -gd -gl -gu -he -hi -hr -hsb -hu -hy -id -is -it -ja -kk -km -kn -ko -lt -lv -mai -mk -ml -mr -ms -nb -nl -nn -or -pa -pl -pt-BR -pt-PT -rm -ro -ru -si -sk -sl -son -sq -sr -sv -ta -te -th -tr -uk -uz -vi -xh -zh-CN -zh-TW" 0 KiB
Is this still a problem? Please update bug with current information if it is and reopen.