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uBlock Origin is no longer available in the Chrome store
(chromewebstore.google.com)
This is a most excellent place for technology news and articles.
Safari had its own web engine, WebKit, which chromium’s web engine, blink, is actually a fork of.
Opera Used to have it’s own web engine, presto, but they rebased to blink in 2013.
But yah, your options these days for the basis of your browser are basically WebKit(Apple), Gecko(Mozilla) and Blink(Google).