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One Home/House. Two PCs. a. WINDOWS 1O b. LINUX 22.3 Both share One Mouse One Keyboard One Monitor. I have a FIREFOX account and have joined both PCs to MOZILLA. I have activated, deactivate and successfully used FIREFOX SYNC. I keep getting emails from MOZILLA stating that someone else signed on to my email acct. and a MOZILLA supplied a 6 digit code to confirm. I know it was me, so I confirm using 6 digit code and no problems. My question is. Who, How or can I inform so MOZILLA/FIREFOX recognizes both PCs. Also. Have been thinking about purchase of a YUBIKEY/KEYs for security. I know, for loss prevention, it is best to purchase 2 Keys. But can a single YUBIKEY be shared on both PCs. Or, do I need to purchase separate keys for each PC? So 4 Keys... 2 Keys for the WINDOWS 1O and 2 keys for the LINUX PC?