com.apple.WebKit.Plugin.64.xpc Had the following appear when attempting to login to an account.  What does it mean &amp; should I approve?
 com.apple.WebKit.Plugin.64.xpc wants to use your confidential information stored in "v4.services.acrobat.com" in your ketchain.
To allow this, enter the "login" keychain password.

Always Allow            Deny          Allow
Unless you trust that you understand what that app wants from the keychain (which could be a harmless - secure token generated to not track you but store a session or could be the password to a very important service and not harmless t all) - the best option is to deny the request and see what breaks.

Unless you have a good reason to allow access to keys, you shouldn't.