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 Firefox Extended Support Release (ESR) to open and save MAFF and MHTML archives.

The technology required by Mozilla Archive Format is no longer supported in Firefox since November 14, 2017, and support in Firefox ESR ends on August 21, 2018.

On February 21, 2018, most installations of the Mozilla Archive Format add-on in Firefox ESR will be updated automatically to provide advance notice of the end of support.

The option to save web pages as MAFF or MHTML will be disabled by default.

You will be asked to convert your saved pages to view them in future versions of Firefox.

On August 21, 2018, most installations of Firefox ESR will be updated automatically to a new version that does not support the Mozilla Archive Format add-on. The Save Page WE add-on can be used instead to save complete web pages in a single HTML file, with better accuracy than the browser's standard save system. This add-on is not compatible with current versions of Firefox ESR, but it can be used on the latest version of Firefox.

Other software supporting MAFF and MHTML archives