.MAFF File Extension
Mozilla Archive Format File
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What is a MAFF file?
A MAFF file is a compressed archive created by the Mozilla Archive Format add-on, which was previously available for Mozilla Firefox and Mozilla SeaMonkey. The file contains one or more webpages, saved so the user can view them offline. MAFF files are Zip-compressed, so you can decompress them and view their contents with any Zip-decompression utility.
Prior to 2018, Firefox and SeaMonkey users could install an .XPI add-on called Mozilla Archive Format. This add-on allowed users to save a webpage or set of webpages as a MAFF archive. Users could then open the archive in Firefox or SeaMonkey to view the webpages the archive contained, even while offline.
In addition to storing webpages, MAFF files store the webpages' metadata. The files also contain all downloadable media content, such as images, audio, or video files, that the saved webpages contained.
How did users create MAFF files?
After installing the Mozilla Archive Format (MAF) add-on, users could save webpages as MAFF files by selecting File → Save Tabs As... or File → Save All Tabs As... from Firefox's menu bar.
Does Mozilla Firefox still support MAFF files?
Mozilla Firefox 57 and later versions do not support MAFF files. However, you can still install the MAF add-on and use it to open MAFF files in Mozilla Firefox 56, which is still available for download online.
How to open a MAFF file
In addition to being able to open MAFF files in Mozilla Firefox 56 using the MAF add-on, you can decompress the files and view their contents using any Zip-decompression utility, such as 7-Zip (Windows), Apple Archive Utility (Mac), or B1 Free Archiver (cross-platform). Before doing so, you may have to change the file's extension to .zip.