In doing some research about this, I came across 
https://support.mozilla.org/en-US/questions/1050588
which lead me to 
resource:///modules/sessionstore/SessionFile.jsm

I currently have a previous.js (dated 08/16), recovery.bak and recovery.js
(along with some upgrade.js- files that are dated most recently 07/29)
The recovery.xxx files before FF is launched are dated yesterday (08/19) at 
what I guess
was around the time I launched it yesterday.
After launch (today, 8/20, about 15:34), the recovery.xxx files changed to 
today's date, about 15:35, but subsequently changed again to 15:59, but have 
not changed again (now is 17:22).

the resource: file says that:
 previous.js  is  "Updated whenever we successfully load from `clean`"
and that for each of:  recovery.js and recovery.bak 
"... this file is therefore removed during clean shutdown"

I must therefore conclude that FF is essentially crashing each time it
shuts down, since apparently 08/16.

I do not quite understand:
"  Paths: Object.freeze({
    // The path to the latest version of sessionstore written during a clean
    // shutdown. After startup, it is renamed `cleanBackup`.
    clean: Path.join(profileDir, "sessionstore.js"),
"
as I do not have anything labelled cleanBackup or sessionstore.js anywhere I 
have looked...

Once or twice I got the "This is embarrassing" (at which I thought:
"That's funny - FF didn't crash!?!"), but mostly the only difference I
have noted in FF is that when shutting down (File-->Quit) all the tabs
disappear at once, instead of rippling closed from right to left in
maybe 1/2 second(?).


FF is now at 48.0 (48.0+build2-0ubuntu0.16.04.1), but all else is as originally 
reported.

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https://bugs.launchpad.net/bugs/1606763

Title:
  Recently, when FF starts up, not all of the restored windows/tabs are
  the most recent ones.

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