Flagfox 6.1.15 for Firefox 60+ has been released and is available for update and download from AMO.
Flagfox 6.1.15 changelog:
- IPv4 & IPv6 address location database updates for June 2019
As far as I’m aware, Mozilla has completely fixed the catastrophic addon authentication breakage from last month, so everything should be working fine again.
On a separate note, Mozilla seems to have finally gotten around to fixing some issues with their addon submission validation system and it is no longer convinced the locale files are full of naughty words.