We don't have an iPhone app due to Apple's restrictive app store rules.

You can contact your mobile phone operator or Apple for specific features of your iPhone.

I'm baffled by this response. I'm using Bookmarks To Go and it successfully lets me see on my iPad and iPhone tabs that are open in Safari on either of them and also tabs that are open in Firefox on my MacBook Air. I do this using my Firefox Sync account. However, when I'm on my Air I cannot see a way to see the tabs open on my iPhone or iPad. So it's not as simple as "Apple won't let us", surely? Because from either my iPad or iPhone I can see the Firefox tabs that are open, I just can't see anything open on the other devices when I'm in Firefox on my laptop.