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. 😄
Tor browser uses dark mode by default
Is this a recent change? I missed it.
For me it’s dark mode by default. 🤔 I use MacOS but I think it should be the same on all operating systems.
I get light mode on Tor Browser for Android:
Browser supports prefers-color-scheme: yes
Browser exposes prefers-color-scheme as: lightThis 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:
- https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/41895
- https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/41739
- https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/40337
Edit: added another relevant issue
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.
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-schemebeing reported as light seems to be coming from Firefox’s resist fingerprinting feature (which is always enabled on Tor browser).

