It’s actually pretty simple.
If you’re using tmux version 2.1 or higher, then you’ll most likely just need to add the following to your
set -g mouse on
Once you’ve saved that to your
.tmux.conf file, you’ll need to restart the tmux server.
$ tmux kill-server
$ tmux # start tmux with new config
And now you should be able to use your mouse-wheel to scroll through your terminal buffer, as well as highlight text and have it scroll properly.