I just noticed this folder :
C:\Users\XXX\AppData\Roaming\Mozilla\Firefox\Pending Pings
left behind after exiting FF portable.
Maybe it needs to be cleared up like crash-reports.
Noticed it in v55.
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I can confirm this is an issue introduced in 55.0 as that's the version Firefox added this. I'll ensure that the next release handles removal of this empty folder.
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I also noticed this :
HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins\@adobe.com/FlashPlayer
Not sure if that's a bug.
Thanks for all the work you put in.
The Pending Pings folder is handled in Firefox Portable 55.0.3
Sometimes, the impossible can become possible, if you're awesome!