Platform 15.0.2 (May 17, 2018). Please donate.
400+ real apps, New: Falkon browser (Jun 04, 2018)
Over 980 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 22.214.171.124
Things have got to get better, they can't get worse, or can they?