From version 16 Firefox supports installing Web Apps from the Firefox Marketplace, which may break portability.
In contrast to Add-ons, the Apps are installed on Windows as an .exe launcher with its own folder in the Windows program data directory. When installing an app, Firefox also creates a desktop and Start menu shortcut as well as an entry in the list of installed programs.
Will there be a way to make those apps also portable, or is the only way not to use that feature?
Regards,
Leon
We may look into it in the future. But right now, as with Chrome apps, they are simply not portable.
Sometimes, the impossible can become possible, if you're awesome!