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Dark mode’s bright future: How dark mode will transform Wikipedia’s accessibility
(diff.wikimedia.org)
This is a most excellent place for technology news and articles.
Webextensions get their own webprocess as well as running in the website. I don’t have a link but if you read their source they just pass a lot of data to their process to determine things (last i looked some years ago).
There is a trade off of executing more things on the site vs transferring a lot of data. Either way it’s a heavy extension.