For the SpiderZilla Firefox Extension to work with K-Meleon 74.0 and K-Meleon 75.0 Beta, download SpiderZilla
https://addons.cdn.mozilla.net/user-media/addons/1616/spiderzilla-1.6.0-fx+mz-windows.xpi and rename it to {3cd27e92-1a30-11da-94c6-00e08161165f}.xpi
Next copy {3cd27e92-1a30-11da-94c6-00e08161165f}.xpi into the extensiosn folder.
Then download SpiderZilla
http://kmext.sourceforge.net/extensions/spiderzilla.7zfrom K-Mwleon Extensions Central
Last extract macros from SpiderZilla
http://kmext.sourceforge.net/extensions/spiderzilla.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.