[PLUG] HTML Visited link highlighting - not the usual change

[Dick Steffens]

It used to be, when I clicked on a link that opens in a new tab, Firefox 
left some kind of highlighting around that link, so that when I came 
back to that page it would stand out. Recently that behavior changed so 
that the link is not highlighted when I come back to the page. This is 
not the same as visited vs. not visited.

Is that highlighting an HTML thing that can be controlled?

-- 
Regards,

Dick Steffens