It is beginning to appear that just about everything that is connected with Adobe (pdf viewer & flash) has been disabled on most macs. I believe this is done on purpose by Apple.
Similar to what's happening with anything connected with Google.
Apple continues to try to control the world.
I don't even have that plug-in listed in my Library, so there's nothing to remove. Using Google Chrome does work, thank goodness.
I do have to print as .pdf file many bank and financial statements for my non-profit. It is becoming more and more difficult.
Fortunately, I still have a Windows 7 computer with which to accomplish many of these tasks that Apple is blocking. Are you listening Apple? do you care?