Automatically change Firefox's theme based on the time
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automaticDark - Time-Based Theme Changer

This is a simple Firefox WebExtension that allows you to automatically switch between your themes based on the current time.

Set Firefox to change the UI to a dark theme during the night and change back to a light theme during the day!

Try the extension at


  • Set the sunrise and sunset times
  • Choose the daytime theme and nighttime theme to switch between
  • Set how often you would like the extension to check the current time


Options page in version 1.0.2

  • Screenshot of the Options page in version 1.0.2.

Feedback / Contributions

Feedback and pull requests welcome!

What do you think? Is there something the extension can be doing better or can be doing that it is currently not?