Browser tabs. They multiply like bunnies, and if you’re like anyone else, you have oodles of tabs open on your Mac, iPhone, and iPad. But you may not know that Safari has a great tab-management feature that lets you access all the open tabs on all your devices. (Make sure to enable the Safari switch in System Preferences > iCloud on the Mac and in Settings > YourName > iCloud in iOS.)
On iOS, tap the tab button to see local tabs as thumbnails at the top of the screen and lists tabs from other devices beneath. On iPhone you’ll need to scroll down to the bottom of the tab list to see them
On Mac, Click the “Show Tab Overview” on the button bar.
Click or tap any tab to view it. To close an unnecessary tab, in iOS, swipe left and tap Close; in macOS, hover over the tab name and click the x button that appears.