[Bug] [Firefox] Styles are not applied to chat.google.com/mail.google.com

[KONEY]

As per subject, StyleBot custom CSSs are ignored when on chat.google.com (which redirects to mail.google.com)

Browser

Firefox Dev Edition 139.0b10 - Windows 10

To Reproduce

Go to chat.google.com, crate a custom style

Expected behavior

see the styles applied