To submit suggestions for new or changed features, may I suggest: Feedback: https://qsurvey.mozilla.com/s3/FirefoxInput/

Please let us know if this solved your issue or if need further assistance.

OK, but what are the replacement suggestions for now ? Regards. j-p

j-p_FF said

Savings as .mht or .maff formats are no more available with FF. But we need that option !

Curious are those formats from FF or where are they coming from?

Indeed, the add-on was so recommended by Mozilla and in-bedded in FF (eg these formats were provided in the "Save as" menu), and, also, I am familiar with these options since a so long time that I forgot that they were provided by an extension (Mozilla Archive Format). Unfortunately, this add-on is not compatible with Quantum, and I don't find any replacement option to save pages in single file formats (instead of a file + folder).

This extension works by inlining page resources into the HTML file, rather than zipping up the file+folder. You might want to give it a test and see what you think:

https://addons.mozilla.org/firefox/addon/save-page-we/

Thank you very much jscher2000. I will try it.