One complaint I and many others have had with Safari was the lack of Favicons in tabs. Well, with Safari 12 on Mac and iOS complain no more.
To enable Favicons on tabs in macOS:
First off you will need to have updated to Safari 12 and be running either Sierra or High Sierra. Now open Safari and go to Preferences > Tabs > Show website icons and check the box.
To enable Favicons on tabs in iOS:
First off you will need to running iOS 12. Now open Settings and go to Safari > Show icons in tabs and turn it on.