You are unable to sign into sync on 2022-11 (seems to be a recent issue from Firefox's side)
If you try to sign in using the normal settings, it will let you sign in, but it won't redirect you back, just to your account settings.
If you try to sign in using about:accounts you will get an "Blocked by Content Security Policy override" error. Disabling "security.csp.enable" in about:config to sign in is a work around. Seems like an easy fix (in theory).
You are unable to sign into sync on 2022-11 (seems to be a recent issue from Firefox's side) If you try to sign in using the normal settings, it will let you sign in, but it won't redirect you back, just to your account settings. If you try to sign in using about:accounts you will get an "Blocked by Content Security Policy override" error. Disabling "security.csp.enable" in about:config to sign in is a work around. Seems like an easy fix (in theory).