| 10. I just recently learned of Firefox DNS prefetching:
| So I turned it off, changing network.dns.disablePrefetch;true to
| network.dns.disablePrefetch;false
|

I hadn't noticed that one. The default seems to be
true, which seems to make sense. Why do DNS lookups
for sites you might not visit?

| 16. Unfortunately, I could delete all the garbage bookmarks that Firefox
| installed *except* the useless bookmark named "View Pocket List".
|
| *HOW DO YOU GET RID OF THE POCKET BOOKMARK?*
|
| Changing this setting did not work:
| browser.toolbarbuttons.introduced.pocket-button;true to
| browser.toolbarbuttons.introduced.pocket-button;false
|

?? I've never heard of that. Some kind of new junk?
You can change a lot of things through userChrome.css,
but there's no single, complete reference for it....

snip
....It looks like you've pretty well battened down the
hatches.
I wonder about other things. Do you have a firewall
that blocks anything you don't instigate? Most people
who don't are typically having lots of junk, from Windows
Update to AV to iTunes to driver/software update
downloaders going online without asking. I've noticed
even Skype and Dropbox (neither of which I would ever
use, but friends have them) do a great deal of calling
home for no apparent reason. Dropbox seems to do it
partly to sunc files, but it doesn't ask if one wants to
sync files.
So.... if you're opening FF and connecting to the Inrenet
at the same time then I wonder if it's possible that FF is
not the culprit. I don't see any network activity when I
open FF or Pale Moon.