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Empowering Choice: Firefox Partners with Qwant for a Better Web
(blog.mozilla.org)
This is a most excellent place for technology news and articles.
I think “default” on this context would refer to the search engine that is selected OOTB; Google is the default; the others are merely included. There can be only one default.
Well, semantics. Then I'd have to correct myself and suppose that Qwant would be included.