Unfortunately, none of those links to UNRESPONSIVE SCRIPTS changed anything. ZD does not appear to be opening in either Safari or in Firefox, but in a place of its own.
So, changing the dom.maxscript in Firefox's about:config does not do anything; and you can't configure that in Safari - and anyway, as I said, ZD is opening separately.
As you see from my last Sunday's post, I completely removed ZD (using CleanMyMac), even going so far as to remove the download history and any indication on my computer of ZD, or prism or anything else ZD related. It did not work.
Do you think I should remove it all again again?
Best wishes and thanks!