[jdougan]

.mht us alive and well. It is a MIME wrapper on the files and is generated by Chrome, Opera, and Edge's save option "Webpage as single file" and defaults to an extension of .mhtml.

When I last looked Firefox didn't support it natively but it was a requested feature.

[venusenvy47]

I use SingleFile on Firefox quite often for this purpose. https://addons.mozilla.org/en-US/firefox/addon/single-file/

[rrr_oh_man]

> When I last looked Firefox didn't support it natively but it was a requested feature.

That sounds familiar, unfortunately

[jdougan]

There are firefox plug-ins that claim to support saving as mhtml, I have no experience with them.

[lukan]

I use it regulary. It works on static sites quite well, but subsites are not automaticaly saved, so not crawled.

[felipefar]

Unfortunately it's not supported by Safari either.