Option + Tab is a shortcut built in to Mighty that lets you easily switch between tabs in a given window.
Pressing Option + Tab will move you one tab over while pressing Option + Tab + Tab will move you two tabs over.
Mighty has a built in nudge to remind you about the option + tab shortcut. If you'd prefer to not receive these reminders you can go to Mighty > Settings > Disable Option + Tab Reminders.
