Question 1

What is X Dim Mode?

Accepted Answer

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 over the pure black "Lights Out" theme.

Question 2

Why did X remove the Dim theme?

Accepted Answer

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.

Question 3

Does it slow down my browser?

Accepted Answer

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.

Question 4

Does it work on Firefox or Safari?

Accepted Answer

X Dim Mode is currently available for Chrome (and Chromium-based browsers like Edge, Brave, and Arc). Firefox and Safari versions are coming soon.

Question 5

Is my data safe?

Accepted Answer

Yes. X Dim Mode doesn't collect, store, or transmit any personal data. It has no analytics, no accounts, and no server calls. The full source code is open for inspection on GitHub.

Question 6

Does this work on Twitter?

Accepted Answer

Yes! Twitter is now called X (x.com), and X Dim Mode works on the current version of the platform. If you're searching for a way to bring back the Twitter Dim mode or Twitter dark blue theme, this is the extension you need.

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