HTTPS Everywhere breaks S3 uploader on Stickermule
Uploading a file to Stickermule, e.g. http://www.stickermule.com/products/rounded-corner-stickers/configure?utf8=%E2%9C%93&variant=94&width=&height=&quantity=50, fails when HTTPS Everywhere 2014.1.3 on Chrome is enabled.
The error message in devtools is:
XMLHttpRequest cannot load http://artisan-production.s3.amazonaws.com/. The request was redirected to 'https://artisan-production.s3.amazonaws.com/', which is disallowed for cross-origin requests that require preflight.