[alanh]

Psst: Night Eye is a browser extension that has really, deeply impressed me by managing to give almost every website and web app a good-enough 'night mode,' surpassing all the quick-hack filter() solutions and more common extensions like Darken. https://nighteye.app/

[modzu]

reviews for that look harsh. its limited to 5 sites?? another alternative is (shameless plug) this one:

https://addons.mozilla.org/en-US/firefox/addon/night-light-m...

its open source :)

[lostmsu]

I am using Dark Reader extension. It is available for both Firefox and Chrome. Has advanced settings, like grayscale, contrast, etc.