The little issues have been fixed and the package has finally been migrated over to FriendsOfFlarum.
Updating from Flagrow
This extension replaces Flagrow Mason.
Please backup your data before attempting the update!
You can upgrade from any of the older versions of the Flagrow extension.
Then upgrade from the old extension to the new one:
composer remove flagrow/mason
composer require fof/mason
When you enable the new extension, the permissions, settings and the data from Flagrow Mason will be moved to FoF Mason.
raafirivero yes, PRs welcome! You will probably need to rebase your code on the new FriendsOfFlarum version though.
All the layout-related PRs and issues are still on hold until proper reviews can be conducted.