Flex debugging timing out in Firefox

Recently I was debugging a project in Firefox and couldn't step through the code for more than a minute before I would get disconnected. 

Discovered this link
https://coderwall.com/p/fhhdla

Which suggests: 

1. In your url bar type in "about:config" without the quotes.
2. Locate the search field at the top of the document and enter: "dom.ipc.plugins.timeoutSecs" without the quotes.
3. Double click on that item and set its value to what ever you'd like to increase the amount of time before it considers a plugin hung. 4 NOTE: if you change that value to -1 it should never time out.

And it seems to work for me, your mileage may vary.