About the MAFF file format
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.
- The accuracy of saved pages is unaffected, even though the default file format is different.
- The Save Page WE add-on can be used to save complete web pages in a single HTML file, with better accuracy than the browser's standard save system. The full functionality requires the latest version of Firefox, but most features are also available in Firefox ESR.
- The ability to save as MAFF or MHTML can be enabled again from the options of the add-on, keeping in mind that current versions of Firefox and future versions of Firefox ESR will not be able to open the pages saved in this way.
You will be asked to convert your saved pages to view them in future versions of Firefox.
A guided procedure can be used to convert your saved pages to a different file format. By default, the procedure will look for MAFF and MHTML archives and convert them to HTML pages which can be opened with any browser.
You should always keep a backup copy of the originals, because in some cases the styling might not be replicated accurately. Read the documentation for details.
The conversion is recommended for most situations, but if you have a large collection of saved web pages and converting them is not practical, you may consider the alternative solutions listed below.
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 will be available with full functionality to save complete web pages in a single HTML file.
Other software supporting MAFF and MHTML archives
- MAFF files can be opened using any ZIP extraction utility, and most operating systems can recognize them natively after changing the file extension from .maff to .zip.
- MHTML files can be opened using Microsoft Internet Explorer on Windows, and on other operating systems using Google Chrome. Archives created by older versions of the Mozilla Archive Format add-on may not be fully compatible with recent versions of these browser, and differences in how HTML and CSS is interpreted may make the pages look different even though the archives themselves are fully compatible.
- Other solutions to open MAFF and MHTML archives on Windows, Mac, and Linux may be developed in the future. Information about this third-party software will be provided on this website as it becomes available.