So I’m posting this for the request in the subject, but it could also be for other things that most webbrowsers do that Falkon doesn’t, but aren’t bugs.
Middle-click to close tabs is pretty common.
Someone put in a bug report for middle click of the tab area to reopen a closed tab.
Falkon used to handle pinned tabs but doesn’t seem to anymore.
Any others, and can these be looked into?