If you use tabs ins Safari, you may be familiar with how Command-1 switches to the first tab, Command-2 opens the second tab, and so on. This was first introduced in 2015. The old behavior when pressing Command-1 would open the first bookmark on your Favorites bar. If you like the old behavior, you can easily switch to this through Safari preferences. Just choose Safari > Preferences > Tabs and deselect “Use ⌘-1 through ⌘-9 to switch tabs.” From then on, Command-1 through Command-9 will once again open bookmarks. Regardless of which behavior you prefer, you can reverse it on any invocation with the Option key, so if you set Command-1 to open your first bookmark, Command-Option-1 switches to the first tab.