To jump to a pane in tmux press Prefix q. It does it job if you have lots of panes. After that press target, like 1.

More often these bindings will server you better:

# .tmux.conf

-bind -r h select-pane -L
-bind -r j select-pane -D
-bind -r k select-pane -U
-bind -r l select-pane -R

Now you can jump to a left / bottom / up / right with:

  • Prefix h
  • Prefix j
  • Prefix k
  • Prefix l

Just like in Vim. :)
This protip has been written in 779 seconds