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How do I revert to previous version of Firefox before Firefox Quantum?

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I liked the design and layout of Firefox 56. Is there any way I can revert back? Or can you guys create an optional update for this new engine with the previous look?

I liked the design and layout of Firefox 56. Is there any way I can revert back? Or can you guys create an optional update for this new engine with the previous look?

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https://ftp.mozilla.org/pub/firefox/releases/56.0/ Once you have reinstalled, you'll need disable the automatic updates in the options. The ESR of Firefox is probably safer to use as it's still being patched but you lose 6 months worth of performance improvements.

Alternatively http://www.basilisk-browser.org may be an option for those of us who want support but losing XUL is not an option.