X Dim Mode
The best X theme is back.
Restore the Dim background X (formerly Twitter) removed.
6 themes, custom colors, one click.
Add to Chrome
Add to FirefoxFeatures
Dim is Back
Restores the beloved Dim background that X/Twitter removed. The exact dark blue you know and love.
6 Themes + Custom Colors
Choose from 6 preset themes or pick any color with the custom hue slider.
Works Everywhere
X.com, X Pro, Creator Studio, DMs, modals, settings — every corner of X gets themed.
Bring Back Twitter
Optional Extras: the blue bird logo, the classic font, the old favicon, and "Tweet" instead of "Post."
Syncs Across Devices
Your theme, custom color, and Extras follow you to every computer you sign in on.
Private & Open Source
No tracking, no analytics, no accounts. The full source is on GitHub for anyone to inspect.
Frequently Asked Questions
What is X Dim Mode?
X Dim Mode is a free Chrome extension that restores the Dim background theme that X (formerly Twitter) removed. It brings back the dark blue look many users preferred — plus 5 additional color themes and a custom color picker.
Why did X remove the Dim theme?
In early 2026, X replaced Dim with a single dark mode (Lights Out). No official reason was given, but many users found the pure black background harsher on the eyes — especially on LCD screens where Dim's dark blue offered better contrast and comfort.
Does it slow down my browser?
No. X Dim Mode is extremely lightweight — it only injects a small CSS override on x.com. There's no background processing, no tracking, and no performance impact.
Does it work on Firefox or Safari?
X Dim Mode is available for Chrome (and Chromium-based browsers like Edge, Brave, and Arc) and Firefox. Safari support is coming soon.
Is my data safe?
Yes. X Dim Mode has no analytics, no tracking, and no accounts, and it never sends your browsing data anywhere. Your theme settings sync across your own devices through your browser account. The only thing that ever leaves your browser is your email address, and only if you choose to subscribe to updates — see the privacy policy. The full source code is open for inspection.
Does this work on Twitter?
Yes! Twitter rebranded to X in 2023, but the platform is the same — just at x.com instead of twitter.com. If you miss the old Twitter Dim mode or the Twitter dark blue theme, this extension brings it right back.
Will it keep working if X updates their site?
Yes. X Dim Mode works by overriding CSS color variables, so it's resilient to most layout and feature changes. In the rare case an X update breaks something, we push a fix quickly — the extension updates automatically through your browser.
More of old Twitter
New Extras and fixes when X changes things. A few emails a year.