HaloDark – Fast Dark Mode for Every Website

Dark mode for every website, with almost no slowdown.

Get HaloDark

Available now for Microsoft Edge and Firefox.

Pages load dark from the first frame: no white flash.
Sites that are already dark are detected and left alone.
Turn it off for one site, or switch to “only the sites I choose”.
Brightness, contrast and sepia sliders, plus a keyboard shortcut (Alt+Shift+D).
No ads, no nag screens, no account, no tracking.

HaloDark makes no network requests. Your settings stay on your device.

Limits: HaloDark uses a fast colour-inversion filter rather than rewriting every style, so a few sites with unusual designs may look less polished than with heavier tools. Turn it off for those sites with one click.

Measured overhead

	No extension	HaloDark 0.1.0	A popular dark-mode extension
heavy local page (6000 nodes)	CPU 212 ms · JS 0 ms · load 154 ms	CPU 218 ms · JS 2 ms · load 154 ms	CPU 490 ms · JS 132 ms · load 484 ms
Wikipedia article	CPU 383 ms · JS 107 ms · load 269 ms	CPU 367 ms · JS 70 ms · load 275 ms	CPU 852 ms · JS 264 ms · load 474 ms
MDN docs page	CPU 421 ms · JS 50 ms · load 155 ms	CPU 425 ms · JS 53 ms · load 157 ms	CPU 499 ms · JS 112 ms · load 326 ms

Median of 7 loads per page, fresh profile, lower is better. Measured on our test machine; your numbers will differ.