wget https://fpdownload.adobe.com/get/flashplayer/pdc/27.0.0.187/flash_player_npapi_Linux.x86_64.tar.gz
#解压缩
tar -zxvf flash_player_npapi_linux.x86_64.tar.gz
#将libflashplayer.so拷贝到FireFox的plugins目录下
cp libflashplayer.so /usr/lib64/mozilla/plugins/
mkdir ~/.mozilla/plugins
cp libflashplayer.so ~/.mozilla/plugins/
然后重启firefox即可