Once you click on the "save websites for later" button and it shows you a checkmark indicating it saved successfully, you just need to click the second button right below it and it will restore everything. I hoped it would be visible and clear since it's shown immediately on the front page.

I'm not quite sure what you mean by the little folder icon, but all the tabs should just show up directly on the front. Windows should say "Window 1", 2, and so on. In that way yeah it's a collection of tabs.

As for the shortcuts it's kind of a spaghetti of different operating systems having different shortcut conflicts, and so I've tried to make it so that it's easy to change the shortcuts to your own specifications. See: https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox (It's in the settings page for future reference)

That should not be happening! I think the problem is that the actual Firefox permission popup opens *behind* the Tabby window, so even though Tabby is supposed to automatically disable tab previews once the user denies the permission, it doesn't get a chance to since it's already closed. I'll have to find a workaround for that but for now can you try disabling tab previews directly from the options page?

It should no longer be an issue in v3.1, there was a bug before that where the what's new page would open on every browser update. Hope this helps!