RHEL下火狐用 tar.gz 安装 FLASH 的疑问，需要保存tar.gz不能删除？

Installing using the plugin tar.gz:
o Unpack the plugin tar.gz and copy the files to the appropriate location.
o Save the plugin tar.gz locally and note the location the file was saved to.
o Launch terminal and change directories to the location the file was saved to.
o Unpack the tar.gz file. Once unpacked you will see the following:
+ libflashplayer.so
+ /usr
o Identify the location of the browser plugins directory, based on your Linux distribution and Firefox version
o Copy libflashplayer.so to the appropriate browser plugins directory. At the prompt type:
+ cp libflashlayer.so <BrowserPluginsLocation>
o Copy the Flash Player Local Settings configurations files to the /usr directory. At the prompt type:
+ sudo cp -r usr/* /usr
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上面是tar.gz包中README的安装指引，第一，二步究竟是什么意思？
上网看到有人说libflashplayer.so放到
/usr/lib64/firefox-3.6/ 这个目录，再 ln 到 /usr/lib64/mozilla/plugins/,
这与直接放到/usr/lib64/mozilla/plugins/ 在应用上有什么不同么？