Hello andreas-pubu,

Unfortunately there is nothing we can do about it - you would have to contact the developers of the extension.

But under the reviews I found this :

"This addon was very good and very useful. 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."

If that works for you, then maybe you could update to the latest Firefox version (63.0.1)  ?

Separate issue :

Your system details show that you need to update your Adobe Flash Player - you're running an older version, which can cause problems. Would you please uninstall your current version and install the latest version, which is 31.0.0.122

Uninstaller : https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

https://get.adobe.com/flashplayer/

Note : some 'extras' may be offered in the download.

Dear McCoy,

The problem is not only with opening the files as they can be unpacked, but we have a large collection of files and all the business processes related to them so it is a lot easier to keep on using the MAFF extension, especially since there is no other alternative to saving pages correctly and in one file.

I can only repeat what I said before : you would have to contact the developers of the extension  :(

https://addons.mozilla.org/en-US/firefox/addon/mozilla-archive-format/

But who knows : maybe somebody else here might come up with a perfect solution for you ...... (fingers crossed).

See also:

• Web ScrapBook https://addons.mozilla.org/firefox/addon/web-scrapbook/
• Save Page WE https://addons.mozilla.org/firefox/addon/save-page-we/