Dark Reader is one of my must haves. Turns dark mode on for every site. If a particular site already has its own native dark mode you can turn the extension off for just that site. Not perfect in all cases but works beautifully for most pages you view.
EDIT: Tap To Tab is really good if you are using a laptop without a mouse. Just double tap the trackpad to open a link in a new tab.
To add to this, there’s also a setting to detect native dark themes on websites so it will automatically disable itself on those sites. It’s a great add on.