Can Amazon S3 CORS Solve Firefox's Cross-Origin Font Loading Issues?

Addressing Cross-Origin Font Loading in Firefox with Amazon S3 CORS

Firefox has a long-standing issue with loading fonts from different origins than the webpage. This problem often arises when fonts are hosted on CDNs. While various solutions have been proposed, can Amazon S3 CORS (Cross-Origin Resource Sharing) be utilized to resolve this issue?

CORS Configuration for Font Loading

To enable font loading through CORS, configure your S3 bucket with the following CORS policy:

<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"
  >
  <CORSRule>
    <AllowedOrigin>https://mydomain.com</AllowedOrigin>
    <AllowedMethod>GET</AllowedMethod>
    <MaxAgeSeconds>3000</MaxAgeSeconds>
    <AllowedHeader>Content-*</AllowedHeader>
    <AllowedHeader>Host</AllowedHeader>
  </CORSRule>
  <CORSRule>
    <AllowedOrigin>https://*.mydomain.com</AllowedOrigin>
    <AllowedMethod>GET</AllowedMethod>
    <MaxAgeSeconds>3000</MaxAgeSeconds>
    <AllowedHeader>Content-*</AllowedHeader>
    <AllowedHeader>Host</AllowedHeader>
  </CORSRule>
</CORSConfiguration>

This configuration allows GET requests from your specified domain with specific headers, enabling font loading cross-origin.

Query String Workaround

If Cloudfront is caching the Access-Control-Allow-Origin header, consider using a query string to differentiate between calls from different domains:

For example, for Domain A:

https://hashhashhash.cloudfront.net/font.woff?https_a.domain.com

And for Domain B:

https://hashhashhash.cloudfront.net/font.woff?http_b.domain.com

This workaround ensures that Cloudfront serves the correct CORS headers for each domain.

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