1. Click wrench in bottom right corner
2. Click settings gear icon
3. Turn on 3D View
4. Watch the magic
A couple years ago, I used to use Firefox regularly for web development. I switched to Chrome as my primary browser because of better speed and a better developer console. However, there have been times when I have appreciated the 3D view in Firefox for debugging some pesky layout issues.
Recently I fired up Firefox to use the 3D layout view. But it’s been so long since I’ve used Firefox’s tools, I couldn’t figure out how to get the 3D view to render. Eventually I figured out that I had to turn it on in the settings.