For those not familiar - You can turn on Labs for yourself by first navigating to "My Settings" and then "Labs"
What does this lab do?
This lab adds two options to the new navigation seen below
The "Export pinned pages to clipboard" option will copy the current list of pinned pages to your clipboard, allowing you to share your navigation list with a colleague.
The "Import pinned pages" option opens a modal which allows you to paste in the result of an export
After clicking the Import button, any pages not currently pinned to your navigation will be added.