Tilt: FF 3D Page Composition Extention Made with WebGL
It's a nifty WebGL extension for FF that gives you a 3D representation of element order, etc.

link to its Git: https://github.com/victorporof/Tilt
To install:
Select 'Add-ons' under 'tools'.
Click the gear and select 'install add-on from file.'

Select Tilt.xpi in the resulting dialog.

Once installed, Press Ctrl+Shift+L or turn it on via the tools menu drop down.
Troubleshooting:
If it freezes your FF, try updating your graphics drivers.

link to its Git: https://github.com/victorporof/Tilt
To install:
Select 'Add-ons' under 'tools'.
Click the gear and select 'install add-on from file.'

Select Tilt.xpi in the resulting dialog.

Once installed, Press Ctrl+Shift+L or turn it on via the tools menu drop down.
Troubleshooting:
If it freezes your FF, try updating your graphics drivers.
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