Mozilla Developer Previews are alpha-quality previews of future versions of Firefox. Web authors can test the preview against their website. Users can help find bugs or provide suggestions for future improvements. Helping out won’t take much of your time, doesn’t require special skills, and will help make the next version of Firefox even better.

Developer Preview builds are not final versions of Firefox. They are made available for testing purposes only, with no end-user support. If that sounds scary, you’d probably be better off with the latest version of Firefox that you can

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