Firefox 42 is now the Developer Edition. It brings with it the enforcement of Add-On signing, but there are also other features that are less controversial.

The new look for Windows 10 that Firefox 40 introduced to end users is also featured in the Developer Edition of Firefox 42, with both lite and dark theme versions.

In this version multiprocess Firefox (aka Electrolysis or "e10s" for short) has been enabled by default. The goal of this facility is to render and execute web related content in a single background 'content' process which communicates with the main Firefox process via various ipdl (Inter-process communication Definition Language) protocols.

According to the Mozilla wiki:

The two major advantages of this model are security and performance. Security improvements are accomplished through sandboxing, performance improvements are born out of the fact that multiple processes better leverage available client computing power.

The advice provide by Brian Grinstead in his blog post on Mozilla Hacks is:

If you experience any issues with addons after updating to Developer Edition 42, try disabling incompatible addons or reverting to a single process mode using about:preferences.

Another headline changes is debugging Firefox for Android over wifi - no USB cable or ADB needed.

Brian Grinstead also mentions that the recent release by the React project of its new version of the Devtools for React has initial support for Firefox. 

His list of other notable changes includes:  

• Asynchronous call stacks now allow you to follow the code flow through setTimeout, DOM event handlers, and Promise handlers. 
  
  
• There is a new configurable Firefox OS simulator page in WebIDE. From here, you can change a simulator to run with a custom profile and screen size, using a list of presets from reference devices. 
  
  
• CSS filter presets are now available in the inspector. 
  
  
• The MDN tooltip now uses syntax highlighting for code samples. 
  
  
• When using the “copy” keyboard shortcut in the inspector, the outerHTML of the selected node is now copied onto the clipboard.

together with other UX and CSS enhancements. 

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