Platform 15.0.2 (May 17, 2018). Please donate.
400+ real apps, New: Falkon browser (Jun 04, 2018)
Over 980 million app downloads
Why does Speedyfox portable see Thunderbird portable, but not Firefox portable?
SpeedyFox is configured to look for Firefox Portable by default in its default location. If you removed it previously or run Firefox from a non-standard directory, you can add it manually.
Sometimes, the impossible can become possible, if you're awesome!
I uninstalled SpeedyFox and re-installed it and now it finds everything.