Firefox CORS issue

Hey all, have an issue with Firefox in an app I recently launched. When attempting to hit Appwrite for magic url login, I'm getting a CORS issue in firefox only. Specifically, CORS Missing Allow Header

Firefox is sending an OPTIONS request (which Chrome is opting not to bother with). The options request has tthe following header:

Access-Control-Request-Headers
    content-type,user-agent,x-appwrite-project,x-appwrite-response-format,x-sdk-language,x-sdk-name,x-sdk-platform,x-sdk-version

and the response has the following header:

access-control-allow-headers
    Origin, Cookie, Set-Cookie, X-Requested-With, Content-Type, Access-Control-Allow-Origin, Access-Control-Request-Headers, Accept, X-Appwrite-Project, X-Appwrite-Key, X-Appwrite-Locale, X-Appwrite-Mode, X-Appwrite-JWT, X-Appwrite-Response-Format, X-Appwrite-Timeout, X-SDK-Version, X-SDK-Name, X-SDK-Language, X-SDK-Platform, X-SDK-GraphQL, X-Appwrite-ID, X-Appwrite-Timestamp, Content-Range, Range, Cache-Control, Expires, Pragma, X-Appwrite-Session, X-Fallback-Cookies, X-Forwarded-For, X-Forwarded-User-Agent

All of the requested headers are there, other than user-agent which I am not actually explicitly setting in the SDK anywhere. There is a casing difference, which I have changed in my SDK this morning, however after making the change, the OPTIONS request from firefox still shows everything in lowercase, not capitalized despite that not being what I set.

Any idea how I can resolve this?

The issue can b eseen live right now, if you enter any email in firefox in the login form here: https://wrevo.com and inspect the request, you will see it failing.