title: Does Firefox have an offline throttling mode/disable network feature?
body: <p>I'm doing some front end work and I need to test how the program reacts when it loses a network connection. Firefox has a "Work offline" setting but that drops the connection for every tab -- I only want to disable the network connection for a single tab. Chrome has this with an "Offline" checkbox in the Network tab of the devtools that makes this really convenient.</p>
  
  <p>This is what this feature looks like in Chrome:</p>
  
  <p><a href="https://i.stack.imgur.com/CkbNl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CkbNl.png" alt="Chrome screenshot"></a></p>