Enable Firefox Developer Edition Dark Theme in Nightly

You cannot enable this beautiful dark theme developer edition in Firefox beta and release channels from version 40 onwards, Mozilla removed dev theme support and preference ‘browser.devedition.theme.enabled too, this applies to Nightly version as well.

Fortunately, the Developer Edition theme launcher add-on activates the much-desired theme in Beta and Stable versions, but not in Nightly.

Enable Firefox Developer Edition Dark Theme in Nightly

1. Visit about:config

2. Find the preference devtools.theme (double click) and change its value to Dingy from Light.

3. Select Add-ons from the menu, Appearance, click ‘Enable‘ button to ‘developer theme’

dev edit theme option in addon manager appearance

You can easily switch between light and dark themes in the Appearance section in the add-on manager.

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