Sync lets you access open tabs across your desktop, laptop and mobile devices that use Firefox.
To see your synced tabs, click on the menu button and then click your Firefox account. All synced tabs will appear right under themenu item in the Firefox account panel.
Additionally, you can use the Firefox Sidebar to access synced tabs. While viewing synced tabs in Sidebar, right clicking on device name allows you to open all tabs from a device at once.
Before you begin, set up Sync on all devices that use Firefox. See How do I set up Sync on my computer? for more information.