Adjusted build recreated for bug reproduction: https://community.worldbrain.io/t/database-not-loading-sync-backup-not-working-firefox-macos/726?u=jnv
Install Instructions
Tested with Firefox Developer Edition (80.0b6). You need to disable extension signatures check.
- Download
extension.zip - Go to
about:config(and void the warranty) - Change
xpinstall.signatures.requiredtofalse - Go to
about:addons - Install the
extension.zip, you can just drag & drop the file to the browser window.