This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cross-Origin Request Blocked

more options

I received an unexpected error trying to login at firefox sync. Seeing at console I found: "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.accounts.firefox.com/v1/account/login?keys=true. (Reason: CORS preflight channel did not succeed)."

How can I solve that?

Thanks

I received an unexpected error trying to login at firefox sync. Seeing at console I found: "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.accounts.firefox.com/v1/account/login?keys=true. (Reason: CORS preflight channel did not succeed)." How can I solve that? Thanks

All Replies (2)

more options

When I try that link by clicking it, I get a 503 server error, so maybe that's the real problem that needs to be addressed before Sync users can log in.

more options

Here's the status page for Mozilla services, indicating they are looking into login problems (as of a few hours ago): https://status.services.mozilla.com/