Mozilla Archive Format

Firefox add-on to open and save web pages as single MHT archives.

Installation and Interface

Mozilla Archive Format installs as a small extension within Firefox for Windows. The process follows the standard add-on routine, and once the browser restarts, two new options appear under the Save Page and Open File menus. Configuration is minimal, making the tool approachable for users who only need basic archive support.

Opening legacy MHT files

Many users still keep collections of pages stored in the classic .MHT format that Internet Explorer once popularized. Firefox cannot natively render those archives, but this extension adds that capability. A simple drag-and-drop action or a standard File > Open command loads the saved page, including images and style sheets, within the current tab. The extension interprets the MHT container so the page looks the same as it did in the original browser, which is especially helpful for viewing old documentation or receipts.

Saving pages as unified archives

Mozilla Archive Format goes beyond viewing and provides a convenient way to create new archives. Selecting “Save Page in Archive” stores the current site in MHT format as a single file. This single-file approach keeps all resources together, eliminating the separate folders Firefox usually produces with its default save option. Users can also let the add-on automatically name the archive with the page title, streamlining organization. The saved output closely matches the live site, preserving layout and media without external dependencies.

Performance and compatibility

During tests with graphic-heavy pages, load time remained comparable to opening a local HTML file. The extension also opened MHT files generated by other browsers without layout breaks. Because the feature set integrates directly into Firefox’s menus, the workflow feels native and does not conflict with other extensions. Resource usage stays low, making the add-on suitable for older systems running Windows.

Verdict

Mozilla Archive Format fills a niche that Firefox lacks out of the box. By offering reliable viewing and saving of MHT web archives, it provides a straightforward solution for anyone maintaining offline copies of sites or migrating content from Internet Explorer.