Below are some screenshots of the MAF extension.

Browsing three open archives. Archive 1, a decoded MHT file, Archive 2, some pages from slashdot.org and Archive 3, XPCOM interface pages from xulplanet.mozdev.org. Note in Archive 3 there are some pages that were added on a different day to the archive than the first set of entries.
Shows the location of the Mozilla Archive Format menu. Shows the menu entries for accessing preferences, browsing open archives and finding out about the extension.
MAF allows the user to save all the open tabs in an archive. This screenshot shows the progress dialog shown when the user tries to save all the tabs in the current window in an archive.
Shows the additions to the file menu allowing the user to open an archive, save the current page in an archive and save all the open tabs in an archive.