I have set Orion to open new tabs at the default location (not next to the current tab). However, sometimes I wish to open a new tab next to a particular tab.
This can be solved if Orion is able to add a new item "New tab" to the context menu that appears upon right clicking a tab (regardless of viewing mode - horizontal or vertical tabs). Clicking this should then open the new tab just next to the selected tab.
Orion's tab right-click context menu:
This behaviour is already supported in Firefox and Chrome: