Web ScrapBook is very useful to save as MAFF archives.
I only miss an additional button in order to be able to save the page directly (with no menu).

Since I have hundreds of MAFF files, I had to make a small software to be able to open them directly.
I published this program here:

https://github.com/ChrisBertrandDotNet/OpenMAFF

Feel free to download and use it.
It has been made for all MAFF lovers.