It finally got updated after some years, but since it's not a standalone app, it only appears in https://portableapps.com/support/firefox_portable#second_profile and thus doesn't mention what was actually updated. Can you please mention it here?
See the time difference from the last version at https://sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C...
The icon was updated to the current Firefox icon and the name was changed to Firefox, Portable Edition to match the naming convention used in local installs along with the recent Firefox Portable update. It was also updated to the latest NSIS for the launcher and latest installer. In short, nothing that big. Same with the Thunderbird 2nd profile launcher and the Firefox Private Browsing launcher.
Sometimes, the impossible can become possible, if you're awesome!
As I don't see the name you've mentioned.