After a quick look, I am getting residual files/folders from Foxit Reader, Joplin, Firefox, TeamViewer, and Thunderbird.
It seems related to this issue: https://portableapps.com/node/36569
Shouldn't these apps be using the "DirectoriesMove" dialogue to prevent this? One of the things Portableapps.com advertises is not leaving a trace on the host system. I mean, we're not exactly going for TAILS-level security or anything... but you get what I mean. 
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Sorry, I don't see any info. What OS are you running and what versions of the software. The reader can assume Windows 10 and the latest of the titles you mentioned - but it would be a guess. I mention this because had I not already noticed the \temp folder left behind by FF58 I might have thought FF63 was responsible
On Win8.1x64, Firefox 58.0.2 & 63.0.3, with Adblock Plus 3.4.2 only:
These are the \folders (and various files) created when Firefox starts, so far everything is deleted upon Firefox closing.
C:\Users\User1\AppData\Local\Mozilla
--- \Firefox
--- \updates
C:\Users\User1\AppData\LocalLow\Mozilla
--- \Temp-{8b02cf9g-a4f5-4247-939s-7664lk4a7f1d}
C:\Users\User1\AppData\Roaming\Mozilla
--- \Extensions
--- \Firefox
--- \SystemsExtensionsDev
The only difference I noticed, Firefox 63.0.3 isn't creating (yet) or leaving behind a \mozilla_temp_files folder like 58.0.2 did. IIRC, the folder was created in C:\Users\User1\AppData\Local\Temp.
C:\Users\**Username**\AppData\Roaming\Mozilla\SystemExtensionsDev is the folder left behind for me.
I am also using Win 8.1 x64 and the latest updates.
This was originally fixed in Firefox Portable 57.0.3: https://portableapps.com/node/57289
If you allowed Firefox to auto-update since then, you wouldn't get any of the fixes to the launcher of course. Are you using an older launcher? Does that folder have anything within?
Sometimes, the impossible can become possible, if you're awesome!
I am using an updated (through portableapps) version of Firefox... I could try a fresh reinstall, and see if the issue persists.
Also, no. Nothing is inside the folder. Just being picky.
Could you please close all instances of Firefox, remove that folder manually, then run Firefox Portable and exit. Ensure it fully closes in Task Manager and then check to see if the folder is still left behind?
Sometimes, the impossible can become possible, if you're awesome!
That worked, but I'm pretty sure I've deleted the folder manually before... hm. Let's hope it sticks this time. Thank you. On to these other ones...
For those using auto-update, who wouldn't get the fixes to the Firefox Portable launcher, could they just copy and paste the latest Firefox Portable launcher (FirefoxPortable.exe) from the latest build of Firefox Portable standalone into their existing Firefox Portable folder?
I recommend installing over your existing install. That's how 75% of our users are automatically updated by the PortableApps.com Platform, so it all happens without muss or fuss. The installer includes logic to update files as the launcher is changed. You can install a new copy of Firefox Portable right over your current one and none of your data will be affected, even if it's the same version. (Fun fact: That's how you can fix a broken install if some of Firefox's files got corrupted on a wonky drive or USB connection).
Upgrading: https://portableapps.com/support/portable_app#upgrading
Sometimes, the impossible can become possible, if you're awesome!
In ~/Roaming, Foxit Reader leaves a folder... with 23 files & 12 folders inside that.
C:\Users\**Username**\AppData\Roaming\Foxit Software\Foxit Reader\StartPage 9.3.0\start\en-US etc.
I just tried the above trick, and the files have stayed.
I can confirm this issue. It seems it wasn't updated for the latest start page. I'll work on a revision. In the meantime, you can edit the FoxitReaderPortable.ini file within the App\AppInfo\Launcher directory and update the DirectoriesMove section to:
Sometimes, the impossible can become possible, if you're awesome!
Fixed in Foxit Portable 9.5.0.20723. The Firefox issue mentioned above was fixed earlier. If you experience an app leaving files/folders behind that it should not, please create a new post specifically for that app in the appropriate forum.
Sometimes, the impossible can become possible, if you're awesome!