For the XUL Gear Firefox Extension to work with K-Meleon 74.0 and K-Meleon 75.0 Beta, download XUL Gear
https://addons.cdn.mozilla.net/user-media/addons/162046/xul_gear-1.0.10-fx.xpi and rename it to
xulgear@code.google.com.xpi
Next copy
xulgear@code.google.com.xpi into the extensiosn folder.
Then download XUL Editor
http://kmext.sourceforge.net/extensions/xuleditor.7z from K-Mwleon Extensions Central
Last extract macros from XUL Editor
http://kmext.sourceforge.net/extensions/xuleditor.7z into the K-Meleon Root Folder.