For the KaiRo.at Mandelbrot Firefox Extension to work with K-Meleon 74.0 and K-Meleon 75.0, download KaiRo.at Mandelbrot 4.0.1-signed https://addons.cdn.mozilla.net/user-media/addons/162071/kairoat_mandelbrot-4.0-sm+fx+fn.xpi and rename it to mandelbrot@kairo.at.xpi

Next copy mandelbrot@kairo.at.xpi into the extensiosn folder.

Then download Mandelbrot http://kmext.sourceforge.net/extensions/mandelbrot.7z under Miscellaneous Extensions http://kmext.sourceforge.net/ext8.htm on K-Meleon Extensions Central.

Last extract macros from Mandelbrot http://kmext.sourceforge.net/extensions/mandelbrot.7z into the K-Meleon Root Folder.