Problems Running Firefox

[B J]

I booted my machine and planned on running Firefox only to find that
it had disappeared.  I used it yesterday with no problems.

I re-installed it using pkg and now it won't start at all.  Starting
it from Terminal, I get:

XPCOMGlueLoad error for file /usr/local/lib/firefox/libxul.so:
/usr/local/lib/nss/libssl3.so.1:
version NSS_3.23 required by /usr/local/lib/firefox/libxul.so not found
Couldn't load XPCOM.

1.  What happened?  Why did it disappear from my machine?
2.  It looks like I'm missing a library or a file, but which one exactly?

I'm running FreeBSD 10 (10.2, I think) and I'm using Mate as my desktop.

Thank you.

B. M. Jatzeck