Hi Northernerun! Sorry for the super delayed response. I recently added a feature so that you can export and import your saved tabs via file. It's a bit clunky and unconventional, but that'll have to work until I can implement cloud saving. Unfortunately I've gotten quite busy with an extensive project, so I'm not sure if I will have time for that for the significant future, but manual saving is now an option!

To export/import your tabs, go to the help menu via the "?" next to the "Subscriptions" header in the sidebar. Import/Export buttons are at the top left and right :)