For the Atomic Firefox Extension to work with K-Meleon 74.0 and K-Meleon 75.0 Beta, download Atomic
https://addons.cdn.mozilla.net/user-media/addons/3188/atomic-0.10.1-fx.xpi and rename it to {57880424-6346-4fff-9718-97a88ea6d0e3}.xpi
Next copy {57880424-6346-4fff-9718-97a88ea6d0e3}.xpi into the extensiosn folder.
Then download Atomic Protocol Client
http://kmext.sourceforge.net/extensions/atomic.7z from K-Mwleon Extensions Central
Last extract macros from Atomic Protocol
http://kmext.sourceforge.net/extensions/atomic.7z into the K-Meleon Root Folder.
I could not attach a file for the Atomic Firefox Extension becuase the extebsion is larger than 512 KB.