From: http://blog.sina.com.cn/s/blog_4560b80b0100lqbz.html
The installation of flash in CentOS firefox is very tangled, but Lao Li found a solution. Click this address to download the Flash Player Plug-in source file http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_10_linux.tar.gz
Decompress tar-zxvf Install_flash_player_10_linux.tar.gz. decompress the package and a libflashplayer. so file.
# Ln-s/usr/lib/nspluginwrapper/noarch/npviewer/usr/bin/npviewer
# Sh/etc/sysconfig/nspluginwrapper-v-I/file path/libflashplayer. so
# Cp/file path/libflashplayer. so/usr/lib/mozilla/plugins
(For x86_64 systems, copy so to/usr/lib64/mozilla/plugins) # sh/etc/sysconfig/nspluginwrapper-I/usr/lib/mozilla/plugins/libflashplayer. so (absolute path)
# Sh/etc/sysconfig/nspluginwrapper-l
Open the firefox browser and enter "about: plugins" in the address bar to enter flash. You can see that flashpalyer has been installed. Enjoy the flash webpage!