Co-signed: Safari should display favicons in tabsAdding favicons to the tabs in Safari would put the graphical back in graphical user interface.
Unlike Google's Chrome, Apple's Safari doesn't show favicons in tabs. Originally, Steve Jobs and the Human Interface (HI) team were against it for aesthetic reasons. That opinion has persisted to this day: While it may benefit power users, it wouldn't be ideal for mainstream customers.
Not everyone agrees, though, and John Gruber does a great job summing up why on Daring Fireball:
The gist of it is two-fold: (1) there are some people who strongly prefer to see favicons in tabs even when they don't have a ton of tabs open, simply because they prefer identifying tabs graphically rather than by the text of the page title; and (2) for people who do have a ton of tabs open, favicons are the only way to identify tabs.
Not having favicons on Safari tabs is also broadly and glaringly inconsistent with how the rest of the graphical user interfaces work on both iOS and macOS. And consistency...
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Co-signed: Safari should display favicons in tabs