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Although I would NEVER recommend running old versions of Firefox (especially not as old as 53), you can install any of the older versions of Firefox that have been released. See Install an older version of Firefox.
However, you will be exposed to tons of SERIOUS SECURITY FLAWS as well as many performance downgrades.
It's also important to note that you will often have issues with your Firefox data when you attempt to downgrade. It's important to make a backup of your Firefox profile folder BEFORE attempting to downgrade. See Back up and restore information in Firefox profiles.
Hope this helps.
Изменено Wesley Branton
Note: Some versions of Quantum change how the data files are set up, so they are not backward compatible.