https://support.mozilla.org/en-US/kb/extensions-button

A major user interface overhaul is coming soon! In the meantime, the current UI already allows you to exclude sites from being darkened. If you don’t see the extension’s button pinned in your toolbar, it might still be hidden under the puzzle piece (🧩) menu, where newly installed extensions are grouped

The Android version of UltimaDark is available primarily to satisfy a few users, but it is not actively tested. However, since it is identical to the browser version, it inherits bug fixes and new features automatically. While we’re happy to hear that some users have it working, please remember that UltimaDark remains a highly niche and experimental project, so your experience may vary.

That said, detection of the system night mode on desktop is already planned. If Android Firefox shares dark theme information with web extensions as Firefox Desktop does—which is very probably the case—then the Android version should inherit this functionality once implemented, with a bit of luck.

Thanks for your understanding and support!

Each permission in UltimaDark is added only when absolutely necessary and is used in the most minimal way possible. Browsing history and cookies remains untouched. Clearing the cache is done on key moments (such as updating settings ) specifically to prevent loading unedited resources, ensuring consistent dark mode application across websites.

While UltimaDark might perform better than other tools, such as Dark Reader, on certain websites (e.g., telegraaf.nl), it’s worth noting that Dark Reader is developed by a team of over 40 developers and more than 1300 contributors, whereas UltimaDark is free and still the result of a solo effort.

Fixed in 1.6.11

Thank you for your report !

The extension is still experimental and constantly evolving. To report bugs, share ideas, or track progress, the project’s GitHub page is available. Anyone who wants to be part of the growing community around this project is warmly welcome. Thank you for your patience and support!

Thank you for your report ! UltimaDark does not aim to compare itself to Dark Reader or any other tool. Please keep in mind that UltimaDark is a young, free project, and by nature, it will never be “finished.” Bugs are inevitable since fixing an issue for one site may break functionality for others, especially with only one developer working on it.

The extension is still experimental and constantly evolving. To report bugs, share ideas, or track progress, the project’s GitHub page is available. Anyone who wants to be part of the growing community around this project is warmly welcome. Thank you for your patience and support!