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Dark Background and Light Text is great also ...

https://addons.mozilla.org/en-US/firefox/addon/dark-backgrou...

Fully customizable so you can don't have to go full black/white, you can copy and dark theme you like and use that as a default.

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Can we also choose which web pages not to add dark theme?

Yes, it has per-site configuration from the toolbar; also, a couple of different modes to choose from if one doesn't work quite so well for a given site (invert, CSS, simple CSS). I'm pretty happy with this extension (I switched away from Dark Reader). Also, open source: https://github.com/m-khvoinitsky/dark-background-light-text-...

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