You will find "Hello World" reference extensions in the "Files" tab of this project. K-Meleon has 3 main types of extensions:
Macros are simple, human-readable extensions that any user can modify or even create in a text editor. You can open the macro folder from K-Meleon by selecting "Edit - Configuration - Macros" in the menu. They use the ".kmm" file extension.
K-Meleon Extensions are .7z archives that can be extracted directly into the K-Meleon root folder or installed with the K-Meleon...