I've been using Firefox on device A computer in the evening, and the next day, after opening device B computer from sleep, a tab was open from the device A session (along with some older tabs I kept open, it was placed at the most right location). I am 100% certain I did not have that tab open from previous session on B. The only way this tab would be able to appear on device B is if I somehow triggered a "send tab to device" functionality when working on device A, however, I am 100% sure I did not. Seeing how I would have to right click the tab and select a submenu to trigger that, it seems essentially impossible that I did that by accident. Q: 1. Is there a keyboard combo that could be accidentally hit that would trigger Send tab to device? As far as I could research, there is no such shortcut. 2. Can a website trigger this API and perhaps I approved it by accident? I would definitely also notice this. 3. Is there a sync audit log I could check on either device to see if a tab was synced? I found about:sync-log but nothing really useful in there. This event is so weird that I am considering secirty aspects or a potential exploit vector..