What is Open Tab Sync?
Open Tab Sync is a way to sync your open web pages across browsers, computers, and mobile devices. You can enable Open Tab Syncing in your Xmarks Sync Settings: Xmarks icon > Xmarks Settings > Sync tab > check "Open Tabs".
The next time you sync bookmarks, you will also sync whatever open browsing tabs you have in your browser.
Read more about Open Tabs in the Xmarks User Manual.