There's probably several different extensions that do the same thing, but this is what I use Cascadea[1] for. [1] https://cascadea.app. - Source: Hacker News / about 1 year ago

I don't use mac, but this may be a step in the right direction: Https://cascadea.app. Source: about 2 years ago

For Safari on macOS, you can use Cascadea. Source: over 2 years ago

If the targets are web pages, it is possible to overwrite embedded CSS and / or Javascript in those web pages, so that the "sensitive data" will follow your customized display style. For example, you can change font size & color so that the text will blend into background. You can do that with browser extension like Cascadea (https://cascadea.app) to inject new CSS, and Tampermonkey (https://www.tampermonkey.net)... Source: over 2 years ago

I've disabled all of my extensions... I was running three: Ghostery, Choosy, and Cascadea. No difference. Source: about 3 years ago

Other options include f.lux and redshift. Source: about 1 year ago

Anyway, for dimming screens with overlays (or gamma alteration), Redshift seems to have a -b option. Source: over 1 year ago

Redshift to change your monitor temperature colors(redshift and redshift-gtk packages on EPEL). Source: over 1 year ago

For example, I typically ran things like lxpolkit, nm-applet, redshift, udiskie and xfce4-power-manager when I used i3. Source: almost 2 years ago

You can try redhift but it still warn as experimental for windows. Source: almost 2 years ago