My current installed version of Firefox Portable 52.8.1 ESR loads up and reports as Firefox Portable 60.0.10 ESR.
Somehow Firefox Portable ESR is automatically updating itself. I have had this happen to me twice now. I think the "timebomb" kicks off every 30 to 60 days. At least that's what I seem to remember from when it last bombed out; the main FF 52.8.1 ESR folder timestamp is about 40 days old right now.
When Firefox Portable 52.8.1 does finish it's updating it crashes, forcing a restart of the app and loss of all of my work; I just lost GIGABYTES of queued (using DownThemAll, but without saving the filenames in the queue) file downloads thanks to this unwanted, unexpected, and "timebombed" update behavior. Firefox Portable 52.8.1 ESR will periodically crash until the background updating is completed.
I thought the Portable Apps developers disabled all automatic updating features of the Portable Apps that they package simply because updated binaries from the original developers would/could conflict or crash the skillful packaging work done by the Portable Apps developers.
Why do I stay on Firefox Portable 52.8.1 ESR? I have some "legacy" addons that I need to use to see the screen that have not yet been updated to Mozilla's new addon standards. If I can't see the screen clearly I cannot use Firefox. It's as simple as that.
Is there any hope that the Portable App developers can answer why their packaging is trying to and eventually updates itself from Mozilla?
Knock knock! John T. Haller are you there?
At least I keep a backup copy of my original Firefox Portable 52.8.1 ESR installation. That's one of the biggest positives to using Portable Apps.
Update: I have checked my backup Firefox Portable 52.8.1 ESR install, the "source" of my "working" FF Portable 52.8.1 ESR setup. I can clearly see that "Options->Advanced->Update" then the "Firefox updates" section on that page is flagged as "Never check".
Perhaps this "update timebomb" is buried in the Mozilla source code or controlled by something in "about:config" that simply ignores what is set on the "Options->Advanced->Updates" page.
Further update: I have dug around in "about:config" and found various references to updating the app that were enabled, so I disabled them. I even took the drastic step of removing the app update URLs that are buried in "about:config". I even noticed entries, and one entry might have been a timer, that track when Firefox was last updated, so I suspect they have to do with Firefox's built-in update mechanisms that are buried in Mozilla's source code.
Honestly, I find these undisclosed, hidden updating processes that appear to be "outside" of user control to simply be insidious and wrong. Shame on Mozilla.