I am usually hesitant to recommend browser extensions but I have had good luck with https://darkreader.org/ - They have been around for a while on both Firefox and Chromium and seem to have a credible privacy policy/donations-based business model with a public-facing code base on MIT license. You can force dark mode for all sites that don't have a native one or toggle this functionality on individual sites.

I believe they maintain custom CSS components for popular sites and then fall back to inverting colors and then rotating the hue 180 degrees, or something like that. I have rarely had any issue from it.

~rts

On Mon, Dec 22, 2025, at 00:08, terryc wrote:
> On Sun, 21 Dec 2025 21:51:34 -0500 (EST)
> Xenguy via Dng <dng@???> wrote:
>
>> Hi,
>>
>> From: "The Original Linux" ; Sent: Sunday, December 21, 2025 9:05:49
>> PM:
>> > Hi all,
>> >
>> > Can anybody tell me how to enable dark- mode on Devuan's homepage?
>> >
>> > I get so frustrated, nowadays.  The user should be 100% in control
>> > of themes, but most softwares ignores, or, over-rides the user.  I
>> > have dry-eye syndrome, and the white/blue light emissions from
>> > white pages is actually painful, after several moments. It is
>> > similar to staring at a 60W light-bulb, at 10 feet.
>> >
>> > Is there any way around this?  I've been suffering from these
>> > effects, for decades.
>> >
>> > It was great, when all we had was VT-100s!
>> >
>> > Shalom,
>> > (original) Linuxfan.
>>
>> I think you find and install some 'dark mode' extension for your
>> browser, and take responsibility for your own health.
>
> Does that actually change the appearance of the displayed web page?.
> IME, it only changes your general screen rim appearance.
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