In addition to all the current channels (stable, beta, dev, nightly, esr) we also have legacy builds available if you ever need to test on an old version: https

In addition to all the current channels (stable, beta, dev, nightly, esr) we also have legacy builds available if you ever need to test on an old version: https://portableapps.com/apps/internet/firefox_portable/legacy https://portableapps.com/apps/internet/firefox_portable/lega... We also have the Second Profile utility so you can have as many easily launched profiles as you want portably since Firefox profile manager doesn't work portably.