"Save as single web page" on Firefox

Question

On Internet Explorer, there is an option to save a web page as single web page (.mht). I can't see that option on Firefox.

How can I save a web page as single web page on Firefox?

Answer 1

there's an add-on for firefox which does that.

http://www.unmht.org/unmht/en_index.html

Answer 2

I found an official support page for my problem:

MAFF and MHT support for Firefox

MAFF is a single-file format that contains one or more web pages.
MHT is usually created by Internet Explorer or other browsers. The Mozilla Archive Format add-on can read and create MHT files, with excellent compatibility.