Today I noticed the 3D Inspect element feature for Firefox. Looks cool, here's a screenshot:

Here's how you can get it:
Step 1: Make sure you have the latest version (at least 11.0). Get the latest version here.

Step 2: Right click anywhere in the page then click Inspect Element (Q).

Step 3: At the bottom of the page click the 3D (M) button.

Its a great way to show off Firefox's 3D capabilities. But I haven't been able to find where this can be useful. Don't forget to leave comments about what you think of this feature and where it can be useful as compared to the traditional inspect element.