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About the MAFF file format

MAFF files are standard ZIP files containing one or more web pages, images, or other downloadable content. Additional metadata, like the original page address, is saved along with the content. Unlike the related MHTML format, MAFF is compressed and particularly suited for large media files.

About the Mozilla Archive Format add-on

The Mozilla Archive Format add-on is an independently developed program that can be installed on the Firefox and SeaMonkey browsers to open and save MAFF and MHTML archives.

On or shortly after November 14, 2017, most installations of Firefox will be updated automatically to the new version known as Firefox Quantum. This version does not support the Mozilla Archive Format add-on, and it will not be possible to use it to open or save MAFF and MHTML archives.

Between October 15, 2017 and November 14, 2017

The ability to save web pages as MAFF or MHTML will be disabled by default in Firefox.

You will be asked to convert your saved pages to view them in Firefox Quantum.

Between November 14, 2017 and June 2018

Most installations of Firefox will be updated to Firefox Quantum.

After June 2018

Support for the Mozilla Archive Format add-on on both Firefox Extended Support Release and SeaMonkey will be discontinued.