YSlow always tells me my content is not served from a CDN no matter what value(s) I put in about:config extensions.yslow.cdnHostnames.
I've tried entering my.cdn.com, http://my.cdn.com/folder1/a/b/, http://my.cdn.com basically every variation I could think of and no matter what values I configure it never acknowledges it's hosted on a CDN.
Is this just a giant bug in YSlow or is there some kind of specified format that's not explained anywhere that it wants?