MacStories:

The problem with iCloud Tabs is that they’re limited to Safari, so if you’re using Chrome or Firefox on OS X, you can’t access the tabs that you have open on your iPhone or iPad. For this reason, Josh Parnham has devised a simple and clever solution: CloudyTabs is a menu bar app that lists iCloud Tabs open on all your devices.

I’m surprised at how often I access them and how useful iCloud tabs are.