As always, Firefox Portable has been updated to 54.0: https://portableapps.com/news/2017-06-14--firefox-portable-54.0-released https://portableapps.com/news/201

As always, Firefox Portable has been updated to 54.0: https://portableapps.com/news/2017-06-14--firefox-portable-54.0-released https://portableapps.com/news/2017-06-14--firefox-portable-5... Firefox Portable is a portable package for Windows, so you can run Firefox without altering any local browser installs or leaving personal details behind. It's a fantastic way to run multiple versions side by side with independent profiles for testing both websites and extensions. All versions of Firefox are available including the latest Developer Edition, Beta version, Extended Support Release, and Nightly releases. All packages are open source under the GPL and totally free. And you can test alongside portable packages of Opera, Iron, Maxthon, and SeaMonkey as well as the three main channels of Google Chrome (Stable, Beta, Dev).