Firefox Portable

Using Firefox 57 with syncing via Dropbox. After the browser restarting even on the same device its customization settings are reset to defaults and the Firefox Account Sync is logged off (so re-login is needed after each restart). How to resolve this issue? Thanks!

https://www.mozilla.org/en-US/firefox/

If Firefox portable is closed and I open a cmd.exe window (or run a batch file) with something like this: FirefoxPortable.exe www.mozilla.com
there won't be any problem.

How could one open 2 Firefoxes at the same time?

This message appears when trying it (saying, another instance is already running):
[IMG]https://i.imgur.com/PufvSpP.png[/IMG]

Where could I get the last version of FF to get the add ons working again?

I would like to be able to use my legacy extensions. I will keep using the latest FF, but occasionally need data from my old "scrapbook" extension which doesn't work with FF 57

It seems the portable launcher of that program can't fully handle the change of the drive letters. My profile was created when the USB drive letter was F and works perfectly with it:
https://i.imgur.com/3sa9lvB.png
(the tab size is the right since the TabMix Plus extension works)
https://i.imgur.com/Wi3teym.png
(all the addons have their icons and their options menus are available)

Can we disable updates with FirefoxPortableESR52.2.0

On this thread...
https://portableapps.com/node/56695

...John TH said that Firefox is not supporting XP after version 55, and thus that is the reason why more recent versions of Firefox Portable won't launch in XP. However, I have the same problem in Cherry Tree: v 0.38.0 works fine, but 0.38.3 won't launch.

This problem might affect a lot more apps than just Firefox and cherry Tree, but those were the only two I updated before finding the problem. Any thoughts, John?

Thanks.