Download [patched] Firefox 51.0.1 32 Bit Access

That is correct. You cannot fix this. Use an alternative lightweight browser for the modern web (e.g., Mypal 68 for XP, or Supermium) and keep Firefox 51.0.1 only for the specific legacy app it was downloaded for.

: Fixed a bug (Bug 1333516) where geolocation services were non-functional for Windows users. Multiprocess (e10s) Incompatibility download firefox 51.0.1 32 bit