Portable Firexplorer 0.9.3b2 is available for download here. This is a zip file ready for download and immediate use.
Portable Firexplorer 1.0 has been packaged and is ready for download. This is a zip file ready for download and immediate use. 1.0 is the very first release to be available as an msi installer. Documentation on the msi file is available here and must be read before you attempt installing.