Platform 14.4.1 (Apr 02, 2017). Please donate.
300+ real apps, *new* calibre (Jan 18, 2018)
Over 950 million app downloads
The download link is broken
That link takes you to the U3 download site.
FF 1.5 for U3 or otherwise is no longer supported, it is unlikely the link will be restored.
The most current version they have of FF4U3 is 188.8.131.52
Things have got to get better, they can't get worse, or can they?