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 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 can use the Save Page WE add-on to save complete web pages in a single HTML file. While this add-on may not be able to save parts of the page embedded from other websites, such as comment sections, the accuracy is generally comparable to that of the Mozilla Archive Format add-on.
- The ability to save as MAFF or MHTML can be re-enabled from the options of the add-on, keeping in mind that Firefox Quantum 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 Firefox Quantum.
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, including Firefox Quantum.
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.
Between November 14, 2017 and June 2018
Most installations of Firefox will be updated to Firefox Quantum.
- The Save Page WE add-on will continue to work in Firefox Quantum.
- If you still need to view or convert existing MAFF and MHTML archives, you can install Firefox Extended Support Release (ESR) with the Mozilla Archive Format add-on. If at all possible, Firefox ESR should be installed as a separate user or on a different computer, because using both Firefox ESR and Firefox Quantum with the same user profile is not officially supported.
After June 2018
Support for the Mozilla Archive Format add-on on both Firefox Extended Support Release and SeaMonkey will be discontinued.
- 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.