Add URL to tag <meta> upon saving pages as MHTML <meta name="url" content="URL_ADDRESS" /> User can find the URL in "Site Info" dialog. I find it better and more useful than creating a new about_falkon.mhtml.txt file with URL address, or writting the URL to the filename itself (falkon.org/about -> falkon.org_about.mhtml)
Actually, the URL is inside the file, but Site Info doesn't list all metadata in the MHTML file.
Reopened (marking as Reported): Asking to display all metadata saved by Site Info. Reason: Opening the text file and accidentally saving it, may result in a plain text file unreadable by Falkon. Tested with Featherpad.