One possible solution is that all of these tabs will go into your history, which also can sync between devices if you configure it to. Once you have Firefox open on your desktop, you can click the hamburger menu in the top-right, history, manage history. Once in there, you can select all of the items in your history at once with ctrl-a, right click, then bookmark them all at once.

If it’s crashing while trying to open the synced tabs, you may need to turn off the tab syncing first in sync settings.