The firefox config checks for 3.32.1 DEBUG: configure:10204: checking for NSS - version >= 3.32.1 The ebuild only lists >=dev-libs/nss-3.32 Fixed version here https://github.com/tgbugs/tgbugs-overlay/blob/master/www-client/firefox/firefox-56.0.ebuild
Created attachment 497196 [details, diff] patch Patch that fixes the issue.
*** This bug has been marked as a duplicate of bug 632456 ***