hello, this option apparently isn't implemented yet - the only thing that comes close is the about:sync-tabs that show the tabs from other linked computers when tab syncing is enabled...

Hello, madperson. Thanks a lot for answering. Did not know "about:sync-tabs", I admit. Tried it and got an empty windows. Could the reason be that "about:sync-tabs" must be executed on the Firefox "master" machine, i.e. the one where I created my Sync account? If this is true then one of my problems is that I cannot remember which machine this was. <blush> Cheers, Karl

hello, i don't have any inside knowledge in how the sync feature is working - but i think there is no such thing as a "master" device, they are all on the same level...

please check that tab-syncing is enabled in firefox > options > sync

I really think this needs to be fixed, since currently there is no way for me to know if someone managed to access one of my devices and secretly add itself to the list. This means there should also be a way of kicking out a device, in case you recognize an unknown device. How this should be done is somewhat more difficult, since it would allow a perpetrator to kick off the legitimate user. But perhaps this can be solved by not allowing a user on one device to kick off more than one other device, so if you have two, then you're safe.

Then again, perhaps Mozilla doesn't have access to the list of paired devices?

If you are syncing tabs, in about:sync-tabs you should see each device that is set up to sync tabs.

Right, but what if the malicious person doesn't sync tabs?