This post will guide you through the steps to disable dark theme and restore light theme or vice-versa of Firefox developer edition.

1. Open a new tab. Enter about:config in address bar. Below prompt will appear.

2. Click I'II be careful, I promise! Button.

3.Search for devedition
 
4. Double click browser.devedition.theme.enabled row.

5. Enjoy the theme you want.

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