Here is a way for you to keep using Safari and see all PDF fonts rendered correctly.
Go to www.adobe.com and scroll to the bottom. Click on the Acrobat Reader DC and install that to your Mac.
Next, open Safari and follow the below help link from Adobe (Once you open the link, scroll down to the section titled Apple Safari to get what you need.
https://helpx.adobe.com/acrobat/using/display-pdf-in-browser.html