I've just set up Firefox Sync, but it is only working one way. I can see my computer's tabs from my phone but I cannot see my phone's tabs from the computer - if I use the quick access "Show tabs from other devices" it just spins a loading wheel with "Syncing". Also, the "Send Tab" option when you right click a tab does not appear at all. Sending a tab from the phone to computer does not result in anything appearing on my computer. Everything is set to sync on both devices, and I have tried to sync it manually. Both versions are up to date.