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  1. en.wikipedia.org › wiki › DuolingoDuolingo - Wikipedia

    1 day ago · Language, music, and mathematics courses and language assessment. Duolingo, Inc., [b] is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on music, [5] math, [6] and 43 languages, [7] ranging from English, French, and Spanish to less commonly studied languages ...

  2. en.wikipedia.org › wiki › FirefoxFirefox - Wikipedia

    1 hour ago · Website. mozilla.org /firefox. Mozilla Firefox, or simply Firefox, is a free and open source [12] web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current and anticipated web standards. [13]

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