Description of problem:

Opening an instance of spreadsheet from a local website created the crash due to selinux.

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SELinux is preventing /usr/lib64/libreoffice/program/soffice.bin from write access on the file .

*****  Plugin mozplugger_remove (57.0 confidence) suggests   *****************

If you want to to continue using SELinux Firefox plugin containment rather then using mozplugger package
Then you must remove the mozplugger package.
Do
# yum remove mozplugger

*****  Plugin mozplugger (43.3 confidence) suggests   ************************

If you want to use the mozplugger package
Then you must turn off SELinux controls on the Firefox plugins.
Do
# setsebool -P unconfined_mozilla_plugin_transition 0
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Also see:

https://bugzilla.redhat.com/show_bug.cgi?id=1069574
https://bugzilla.redhat.com/show_bug.cgi?id=1082223

Version-Release number of selected component:
mozplugger-1.14.3-5.fc20

Additional info:
reporter:       libreport-2.2.0
backtrace_rating: 4
cmdline:        mozplugger-helper 1280,1,16,73400321,0,119,1280,837 'ooffice -nologo -norestore -view  \"$file\"'
crash_function: add_possible_victim
executable:     /usr/bin/mozplugger-helper
kernel:         3.13.7-200.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (5 frames)
 #0 add_possible_victim at ./mozplugger-helper.c:850
 #1 handle_rootWindow_event at ./mozplugger-helper.c:984
 #2 check_x_events at ./mozplugger-helper.c:1263
 #3 check_all_events at ./mozplugger-helper.c:1401
 #4 handle_app at ./mozplugger-helper.c:1493