Important applications like Firefox, Chromium, as well as core KDE applications like Konsole and Dolphin have default behaviour of switching tabs with Alt+{0...9}. These actions are defined with "Go to Tab {0...9}" and set to shortcuts of Alt+{0...9} by default. Okular currently not only doesn't have this default behaviour, it isn't even possible to set these shortcuts manually as these actions are not available at all. This breaks user expectation of consistency. Long time ago, even applications like Dolphin didn't have this behaviour and there were bug reports about this, but these were added at some point later: https://bugs.kde.org/show_bug.cgi?id=336926 Please add these missing actions and set them to the widely used standard by default.