[Author/submitter here] There is a button in the tab bar that lets you pick up tabs from your other devices. This uses the Mozilla Sync functionality that also

[Author/submitter here] There is a button in the tab bar that lets you pick up tabs from your other devices. This uses the Mozilla Sync functionality that also syncs bookmarks, login IDs, passwords and extensions between browsers. Now the "tabs on other devices" functionality has its own name: Mozilla View. I actually quite like it and am already finding it useful. I don't use their tab bar, though, so I added a button to the extensions menu.