Mercury Reader: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response.

[braco]

Apologies, not sure where else to post this.

• Platform: Chrome, Mac
• Mercury Parser Version: Mercury Reader 4.3.1.0

Expected Behavior

Post to Kindle

Current Behavior

Error in console, infinite loader:

Access to fetch at 'https://mercury-kindlegen.postlight.com/send-to-kindle' from origin 'chrome-extension://oknpjjbmpnndlpmnhmekjpocelpnlfdi' has been blocked by CORS policy: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response.

Steps to Reproduce

Activate Mercury Reader on article, send to kindle