Before changing your default locale you must have a name, summary, and description in that locale. You are missing 'description', 'name', 'summary'.

Install

• License: MIT License
• Weekly downloads: 0
• Average daily users: 3
• Rating: 0/5 of 0 ratings
• Created: 2017-12-08 17:48:47
• Last updated: 2017-12-24 10:20:08
• Homepage: http://fontisto.com
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/fontisto/
• API: {8d6a6ad9-b7c3-4356-a055-cd6a3a918518}