The default keyboard shortcut for "next tab" is Ctrl + . (control and the point key). Pressing this shortcut triggers this warning: "The key sequence 'Ctrl+.' is ambiguous. Use 'Configure Shortcuts' from the 'Settings' menu to solve the ambiguity. No action will be triggered." Not only the action is not triggered, as the message says, but it also refers to a dialog that is missing in rekonq. This is in my view a serious flaw. Reproducible: Always Steps to Reproduce: 1. Press Ctrl + . 2. 3. Actual Results: The "ambiguous shortcut detected" shows. Expected Results: Either: 1) Rekonq should have switched to the next tab; or 2) The 'Configure Shortcuts' dialog should have been available.
Confirmed on rekonq-2.4.2 from Gentoo. Maybe the shortcut should just be disabled? Then this would never be an issue. It is strange that the popup box reads that this "Configure shortcuts" can be selected from the "Settings" menu, when I don't even see such a menu anywhere.
Development on Rekonq ceased four years ago, and it has been unmaintained since then. KDE recommends using Falkon instead.