Platform 14.4.1 (Apr 02, 2017). Please donate.
300+ real apps, *new* calibre (Jan 18, 2018)
Over 950 million app downloads
Quantum was the codename for the big set of changes introduced in Firefox 57. The portable version was posted the same day as the standard release: https://portableapps.com/apps/internet/firefox_portable
Sometimes, the impossible can become possible, if you're awesome!