One MBP will sync to the other but not vice versa!
On 2015 MBP Mac OS El Capitan 11.6 new Firefox 78.15.0 esr won't sync with my older MBP running El Capitan 11.6 but it will sync to the 2015. How do I get the 2015 replacement computer to sync?
On 2015 MBP Mac OS El Capitan 11.6 new Firefox 78.15.0 esr won't sync with my older MBP running El Capitan 11.6 but it will sync to the 2015. How do I get the 2015 replacement computer to sync?
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You can no longer use Sync with Firefox 78.15.0, as this version used BrowserID that is nop longer supported.
See: