Very, very saddly, I have to report, that the current installer of the Firefox Portable 22.214.171.124 searches your drive and deletes other installations of Firefox.
Just a few minutes ago, I have installed the Firefox Portable 126.96.36.199 on my usb drive (into a folder named "FirefoxPortable"). On the same drive, in another folder (named "FirefoxPortable1"), there was my old installation of Firefox Portable.. Now it is entirely gone, the "FirefoxPortable1" folder is empty.. The settings, the history, the bookmarks, the extensions ..everythings deleted. I tried to undelete but it's of no good.
I read that the installation manual tells me to backup my settings before I install. Well, I did! I am pretty sure! So why the hell the installer touched that backup in other directory?? And who the hell wrote an installer that deletes other applications??? Is not supposed to be possible to have two Firefoxes on the same drive?