About:plugins only sees "OpenH264 Video Codec provided by Cisco Systems, Inc." There is a copy in the system location, and I copied the library to the plugins directory, but Firefox still doesn't see it. [/home/user/firefox]$ ls -al total 79340 drwx------ 13 user user 4096 2015-07-30 22:37:24 ./ drwx------ 5 user user 12288 2015-07-30 20:51:08 ../ -rw------- 1 user user 825 2015-06-30 22:58:01 Throbber-small.gif -rw------- 1 user user 659 2015-06-30 23:52:00 application.ini drwx------ 7 user user 4096 2015-07-01 00:34:03 browser/ -rw------- 1 user user 40 2015-07-01 00:33:58 chrome.manifest drwx------ 2 user user 4096 2015-07-01 00:34:03 components/ -rwx------ 1 user user 111424 2015-07-01 00:34:03 crashreporter* -rw------- 1 user user 4003 2015-06-30 22:58:00 crashreporter.ini drwx------ 3 user user 4096 2015-07-01 00:33:45 defaults/ -rw------- 1 user user 127 2015-07-01 00:26:08 dependentlibs.list drwx------ 2 user user 4096 2015-07-01 00:33:58 dictionaries/ drwx------ 2 user user 4096 2015-07-30 22:10:32 downloads/ -rwx------ 1 user user 147776 2015-07-01 00:34:03 firefox* -rwx------ 1 user user 147784 2015-07-01 00:34:02 firefox-bin* drwx------ 3 user user 4096 2015-07-01 00:33:45 gmp-clearkey/ drwx------ 2 user user 4096 2015-07-01 00:34:03 icons/ -rw------- 1 user user 899 2015-07-01 00:34:03 libfreebl3.chk -rwx------ 1 user user 471112 2015-07-01 00:34:03 libfreebl3.so* -rwx------ 1 user user 19384 2015-07-01 00:33:58 libmozalloc.so* -rwx------ 1 user user 752272 2015-07-01 00:34:03 libmozsqlite3.so* -rwx------ 1 user user 219064 2015-07-01 00:33:58 libnspr4.so* -rwx------ 1 user user 966008 2015-07-01 00:34:03 libnss3.so* -rwx------ 1 user user 561528 2015-07-01 00:34:03 libnssckbi.so* -rw------- 1 user user 899 2015-07-01 00:34:03 libnssdbm3.chk -rwx------ 1 user user 119520 2015-07-01 00:34:03 libnssdbm3.so* -rwx------ 1 user user 142856 2015-07-01 00:34:03 libnssutil3.so* -rwx------ 1 user user 17776 2015-07-01 00:33:58 libplc4.so* -rwx------ 1 user user 15184 2015-07-01 00:33:58 libplds4.so* -rwx------ 1 user user 140184 2015-07-01 00:34:03 libsmime3.so* -rw------- 1 user user 899 2015-07-01 00:34:03 libsoftokn3.chk -rwx------ 1 user user 218632 2015-07-01 00:34:03 libsoftokn3.so* -rwx------ 1 user user 203688 2015-07-01 00:34:03 libssl3.so* -rwx------ 1 user user 64383648 2015-07-01 00:34:01 libxul.so* -rw------- 1 user user 11648263 2015-07-01 00:33:58 omni.ja -rw------- 1 user user 136 2015-07-01 00:28:02 platform.ini -rwx------ 1 user user 401496 2015-07-01 00:34:02 plugin-container* drwx------ 2 user user 4096 2015-07-30 22:37:24 plugins/ -rw------- 1 user user 2478 2015-07-01 00:34:12 precomplete drwx------ 20 user user 4096 2015-07-31 01:12:29 profile/ -rw------- 1 user user 707 2015-07-01 00:34:03 removed-files -rwx------ 1 user user 8915 2015-06-30 22:57:51 run-mozilla.sh* -rw------- 1 user user 132 2015-07-01 00:27:51 update-settings.ini -rwx------ 1 user user 192320 2015-07-01 00:34:03 updater* -rw------- 1 user user 681 2015-07-01 00:28:12 updater.ini drwx------ 2 user user 4096 2015-07-01 00:34:03 webapprt/ -rwx------ 1 user user 180840 2015-07-01 00:34:03 webapprt-stub* [/home/user/firefox]$ ls -al plugins/ total 18848 drwx------ 2 user user 4096 2015-07-30 22:37:24 ./ drwx------ 13 user user 4096 2015-07-30 22:37:24 ../ -rwx------ 1 user user 19289472 2015-07-14 21:08:47 libflashplayer.so* [/home/user/firefox]$ ls -al /usr/lib64/nsbrowser/plugins/libflashplayer.so -rwxr-xr-x 1 root root 19289472 2015-07-17 19:16:26 /usr/lib64/nsbrowser/plugins/libflashplayer.so*