You should add a test. Example: https://github.com/wulkano/kap-giphy/blob/master/test/test.js

• context.setProgress('Uploading…'); should be placed above await Fanfou.upload(token, filePath);. Don't show status until you're actually doing the thing you describe.
• You don't have to try/catch here. We catch any error from plugins and display a notification.
• default: 'Your consumer key', is incorrect. That is not a default value. You should instead use the description key for this: description: 'Your consumer key',.
• The useNofanConfig config needs a description key with a description of what it actually that. It's not clear from the title.