On Thu, 30 Jun 2016 11:24:48 -0500, Char Jackson wrote:

You can view the Windows DNS cache with the following command:

ipconfig /displaydns

By repeatedly running the following command, which simply pulls out the
Time To Live (TTL) values for easier visibility, you can see the TTL
starting values as well as seeing the TTL count down toward zero. When
it hits zero, the DNS entry is removed from the cache.

ipconfig /displaydns | find "Time To Live"

Lastly, for testing purposes, you can clear the Windows DNS cache with
the following command:

ipconfig /flushdns

There are no ill effects as a result of clearing the cache. It simply
rebuilds over time, as necessary.

I have wiped out both the Windows and Firefox DNS cache.

For example, on Windows, I ran:
c:\ ipconfig /displaydns
c:\ ipconfig /flushdns

And, on Firefox, I changed the network.dnsCacheEntries and a few other
related settings.

On Windows, using "Process Hacker", I turned off the service "Dhcp
client" (aka C:\WINDOWS\System32\svchost.exe -k netsvcs) and I changed the
Firefox DNS cache from 400 (which is the default) to 0.

I am testing it all now, as I made over 40 related changes in the past
day, and Firefox seems to have quieted down greatly with respect to both
CPU intensity consumed and rogue web sites visited without my knowledge -
but time will tell as sometimes small wins are fleeting.