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I use Dark Reader. It lets you toggle dark/light (even based on your system theme), tweak various color settings, exclude sites, etc.
Yeah, it's gotta inject the new theme. Definitely worth it though. It works on mobile too
Yes, there's no way around that, but you can change the filtering mode to make it faster.
If you click on the icon of the extension, then click more, there are 4 filter modes you can choose.
Accept that they all suck and lower the brightness on the monitor instead
I just changed the defaults to have white backgrounds show up as grey. Not perfect, but it works well enough.