Hi, Thank you for reaching out! Could you please [https://bugzilla.mozilla.org/enter_bug.cgi? file a bug report on Bugzilla], Mozilla's bug tracker, so that the developers could take a look? We'd also appreciate you sharing more details about the issue, including: * Your operating system version * Your Firefox version ([[Find what version of Firefox you are using]]) * Your headphones model and manufacturer * If possible, more details about how the sound is distorted If you don't feel comfortable enough with filing a bug, just let me know, post the necessary info here, and I'll create a bug for you.