Sync tabs doesn't work right
I'm using firefox sync with an own sync server.
Since a few weeks the synchronization of tabs doesn't work right. I use five devices. On my Macbook, the iPhone and the iPad mini I can see and reach the tab-sync of these three devices.
On another iPad and an Linux-PC, wich I added at last, I can see the tab-sync of all five devices.
How can I force the first three devices to sync the tabs of all five devices? I did alread several steps of testing and trying, like manual synchronization or remove and adding again all devices to the account.
It would be great to find some help! Thanks in advance and best regards - Daniel