I use two browsers, Firefox and Safari operating under OS X 10.9.4. Do I have to install Flash twice -- once initiating from each browser? Or does the plug in reside in some sort of cache, plugging itself into whichever browser calls upon it?
No, you don't have to install twice. The same plugin resides in a location accessible by both Safari and Firefox and works in both browsers.
Thank you very much. And thanks a second time for such a quick reply.