- Middle- or Ctrl-click on a link should open it in a new tab (fg/bg according to `tabs -> background-tabs`)
- When clicking the link with shift, `background-tabs` should be reversed accordingly.
- Ctrl + Mousewheel should zoom in/out
- Back/forward keys on mouse should navigate back/forward
- With `input -> rocker-gestures` set, no context menu should be shown, but pressing left+right/right+left buttons should navigate back/forward
- When setting `input -> rocker-gestures` dynamically, the context menu should be hidden/shown accordingly.