How to Resolve Firefox Cross-Origin Font Loading Issues with Amazon S3 CORS?

Amazon S3 CORS and Firefox Cross-Origin Font Loading Resolution

Recent updates and a working solution have resolved the long-standing issue with Firefox failing to load fonts from domains other than the current webpage. This issue commonly arises when fonts are served through content delivery networks (CDNs).

Utilizing Amazon S3 Cross-Origin Resource Sharing (CORS), this problem can be addressed with the following approach:

Sample S3 CORS Configuration

<?xml version="1.0" encoding="UTF-8"?>
<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>

Understanding the Solution

The provided S3 CORS configuration enables requests for font resources from specified domains, granting browsers permission to load fonts from different origins. It allows methods, headers, and response headers as follows:

• AllowedMethod: Specifies the HTTP GET method, used by browsers to fetch fonts.
• MaxAgeSeconds: Sets a caching period for responses to 3000 seconds, allowing browsers to reuse cached fonts.
• AllowedHeader: Grants permission for browsers to include Content-* and Host headers in their requests, necessary for font loading.

Alternative Solution for Cloudfront Caching Issue

In cases where Cloudfront caching is encountered, a workaround is to utilize a query string to differentiate between calls from different domains:

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

This approach ensures that Cloudfront serves the appropriate Access-Control-Allow-Origin header based on the specified query string.

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