Firefox Portable isn't published by Mozilla, it is a repackaged version originated by PortableApps.com for Windows OS's. There are other publisher's who have created MacOSX and Linus versions of Firefox Portable. [https://www.google.com/search?q=Portable+Firefox+for+Linux&sourceid=mozilla-search&start=0&start=0&ie=utf-8&oe=utf-8num=100&gws_rd=ssl Google search for '''Portable Firefox for Linux'''] The Windows version can be used on Linux thru [https://www.winehq.org/ '''Wine''']. Or look thru that Google search for a portable version created by a Linux user or user group.