GAIA GPS does not work in my safari.

Helo. 

I have a old Macbook pro (mid 2010). I have macOS High Sierra (10.13.6) and use Safari 13.1.2 (13609.3.5.1.5). From yesterday I find GAIA GPS doesn't work on this browser but works normally on Google Chrome.

How can I easily solve this question?

Thanks