Q. I cannot open Westlaw using the Safari browser on a Mac

If Safari on your Mac isn't working as expected, one of the solutions on the Apple Support FAQ may help:

https://support.apple.com/en-gb/HT204098.

The best option on Safari would be to open a private browsing window (also known as incognito mode). Another option would be to access Westlaw on a different browser such as Google Chrome or Mozilla Firefox.