It opens on this Mac without any problem.

1. If Safari is slow, stops responding, quits unexpectedly, or has other issues
https://support.apple.com/en-us/HT203353
Section: Manage Extensions
https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac
2. Delete com.apple.Safari.plist file and test.
Empty the Trash.
Quit all applications.
Hold the option key down and click the "Go" menu in the Finder menu bar.
Select "Library" from the drop down.
Library > Preferences > com.apple.Safari.plist
Right click on it and select "Move it to Trash".
Restart and relaunch Safari holding the shift key down.
Click the “View” menu in the menu bar and click”Show Favorites Bar”.
If this doesn’t help, “Put Back” the com.apple.Safari.plist
Right click on the Trash icon in the Dock and select “Open”.
Right click on the com.apple.Safari.plist and select “Put Back”.
Select ”Replace” from the dialog when it appears.