A new feature has been added on the beta site: importing and exporting settings! To use this feature, go to the “More…” menu in the top bar and choose “Import/Export Settings…”.
This opens a popup where you can click the big Download button to download a ZIP file containing all of your settings, and a drop-zone for importing a ZIP file you’ve previously downloaded. You can transfer the ZIP file to another computer, open the same popup in a browser and drag it into the Import drop zone to import your settings.
You can also use transfer settings to a different browser on the same computer. Once the feature has been deployed to the main site, you’ll also be able to transfer settings between the beta site and main site.