2020-1-15

The nsurlstoraged process was using about 97% of a cpu, and my Macbook was
running rather hot.  So I googled it, found several descriptions of the
problem. They described mostly clearing out the cache, killing related browser
processes, and waiting for the process's cpu usage to drop.  It didn't.

So I killed it off, along with all the browsers that were using much time,
and restarted the browsers.  I even let them restore the windows they had
before being killed.  So far, the cpu-gobbling nsurlstoraged process hasn't
reappeared.   Wait and see ...

And after another hour or so, it's back, with about 99% cpu usage.
[update 2020-1-16 11:03]
After killing it off again, it doesn't seem to have come back..
It's even missing the next morning.  We'll see ...