UltimaDark - The Fastest Dark Mode Extension

UltimaDark uses agressive & smart techniques to turn even the sunniest websites into realms of darkness. Although it works well, this is so experimental, it makes lab rats look like seasoned professionals. Go ahead, embrace the shadows! 🦇

UltimaDark - The Fastest Dark Mode Extension is available to install from Firefox Browser Add-ons and for download from this page. It has 768 active users The latest version is 1.6.2, and it was published 3 days ago.

Install from Firefox Browser Add-ons
View source code
Total download count: 0 (Only count downloads from Firefox-Stats)

All available versions

You can find the current and older versions of UltimaDark - The Fastest Dark Mode Extension here. You can download the archived versions or inspect their source codes.

As a free user, you can only download the latest version.

Upgrade to download older versions
 56 versions available for download.

Install XPI file

  1. Simply drag-and-drop the XPI into Firefox to install the add-on.

Install ZIP file

  2. In Firefox browser, go to about:addons to open Add-ons Manager
  3. Click on , then select Install Add-on From File
  4. Select the UltimaDark - The Fastest Dark Mode Extension ZIP file from step 1. UltimaDark - The Fastest Dark Mode Extension is now installed on your browser.