But they don't "automatically" open up on your other PCs. They simply show up in a list of tabs opened on your other devices that are synced to your same google account. Then you can manually open the "remote tab" on the device you are currently on. They will not simply start popping up on your work PC while you are opening tabs at home. And if you are really that worried about even having the smallest amount of access between the tabs of your different devices, then I guess this feature isn't for you.