What is com.apple.WebKit.Plugin.64 and how do I close it to install Flash Player?

I am trying to update my Flash Player.  During the install process it says I need to close the following program:  com.apple.WebKit.Plugin.64  I have no idea what this is or how to close it.  I am running Safari 8.0.2 in OS X Yosemite.  Any help would be appreciated.  Thanks!

i too was trying to update adobe and it kept stopping, saying i needed to close
com.apple.webkit.plugin.64. but i had no idea where that was.  so i opened the activity monitor and found it.  it said it was opened in safari, under our guest account.  i had closed safari under my user name, but didn't realize it was still opened under our guest acct.  once i closed it there, i retried the installation, and i am happy to report it finished it with ease.
so i would say to try and make sure safari is closed for all account users using your computer!!
good luck!!

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