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submitted 3 weeks ago by goestav@lemmy.world to c/firefox@lemmy.ml

In a previous post I asked what your thoughts were on the theme I was working on and it immediately became apparent that users were wondering how this would affect their anonymity.

From my research on the matter I found that this should generally not be a concern. I recommend you read my detailed explanation which can be found in the readme of the source code.

The theme is originally designed for the Tor browser, but I made an extra effort to make it work on Firefox as well. You can install it from the add-ons store if you'd like to check it out. 😄

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[-] XLE@piefed.social 1 points 3 weeks ago

Tor browser uses dark mode by default

Is this a recent change? I missed it.

[-] goestav@lemmy.world 5 points 3 weeks ago

For me it’s dark mode by default. 🤔 I use MacOS but I think it should be the same on all operating systems.

[-] XLE@piefed.social 1 points 3 weeks ago

I get light mode on Tor Browser for Android:

Browser supports prefers-color-scheme: yes
Browser exposes prefers-color-scheme as: light

https://septatrix.github.io/prefers-color-scheme-test/

[-] goestav@lemmy.world 2 points 3 weeks ago* (last edited 3 weeks ago)

This website always reports light for me as well, same goes for manually checking with JavaScript. I think that value gets spoofed regardless of the enabled theme.

Relevant issues:

Edit: added another relevant issue

[-] XLE@piefed.social 1 points 3 weeks ago

So does that mean dark mode is not the browser default? I only linked to this website because it's the most specific, but I also tried duckduckgo and a couple other sites, which all also loaded in light mode.

[-] goestav@lemmy.world 4 points 3 weeks ago

It’s the default (as in default selected theme) for desktop. I’m not sure if that’s the case for Android, I unfortunately don’t own an Android phone currently to check.

The prefers-color-scheme being reported as light seems to be coming from Firefox’s resist fingerprinting feature (which is always enabled on Tor browser).

this post was submitted on 03 Apr 2026
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