Falkon doesn't have any option that I can see to right-click a tab and move it to a new window, a critically useful feature that's available in every other browser (and tabbed application) that I'm aware of.
I filed a merge request that should fix this omission: https://invent.kde.org/network/falkon/-/merge_requests/22
Git commit c7e3c08ef408c8e0a28c9d21b07415fab5179e83 by Adriaan de Groot. Committed on 11/01/2022 at 11:14. Pushed by adridg into branch 'franrogers/falkon-master'. Changes: document new feature M +4 -0 CHANGELOG https://invent.kde.org/network/falkon/commit/c7e3c08ef408c8e0a28c9d21b07415fab5179e83
Git commit 1781ea1fae8f972da442548772813b1e80307a39 by Adriaan de Groot. Committed on 18/01/2022 at 14:56. Pushed by adridg into branch 'master'. Changes: document new feature M +3 -1 CHANGELOG https://invent.kde.org/network/falkon/commit/1781ea1fae8f972da442548772813b1e80307a39