Hi, I'm using Firefox on a couple of Macs and Windows 10 machines for quite some time now. And I keep tabs and bookmarks in sync with Firefox Sync. Has been working great for quite some time. Since somewhere last week, it started giving me headaches. It started with requiring me to log into sync again on one of the machines (can't quite remember wether it was Win10 or Mac). My password (complex 35 characters, managed by LastPass password manager) did not work. Que? OK, so I reset the password with a recovery key (2FA enabled) and was able to log in again. Then another machine gave me exactly the same: log in again, password wrong, only way in was to reset password, etc. It seems I can get either all macOS Firefoxes to sync -or- the Win10 Firefoxes to sync, but not both. I tried completely starting over with sync (deleting my account, setting it up from scratch). But still the same problem... I'm at my wits end with this... Anyone else having this problem? Was not able to find a reference on google or the support forums ;-(. I guess it started with Firefox 67.0 (which has an update as I check just now). Any hints or help most welcome :-D Best regards, Donald