title: Insert/overwrite shortcut key in Jupyter
body: <p>What is the <a href="https://en.wikipedia.org/wiki/IPython#Project_Jupyter" rel="noreferrer">Jupyter</a> shortcut key to toggle between insert and overwrite mode whilst editing?</p>
  
  <p>I must keep hitting it by accident and then cannot turn off overwrite mode. I have looked at the list of shortcuts in Jupyter and online, but I could not find a match. I am working on Firefox on a Linux virtual machine running on a Mac.</p>