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Does Firefox Quantum install in my present browser 57.0 (64 bit) or does it install as a new browser in addition to my old firefox browser?

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If I install Firefox Quantum, does it install over my present Firefox browser (57.0 (64 bit), or is it separate from that browser?

If I install Firefox Quantum, does it install over my present Firefox browser (57.0 (64 bit), or is it separate from that browser?

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Firefox Quantum is Firefox 57.0, they are one and the same. Quantum is just the code-name for the next few series of Firefox releases. If this answered your question, mark as solution!