remove useless twitter garbage

garbage.css

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("twitter.com") {
    li.promoted-trend { display: none; }
    li.promoted-account { display: none; }
    div.promoted-tweet { display: none; }
    div.flex-module.trends-container { display: none; }
    div.flexmodule.trends { display: none; }
    div.module.trends { display: none; }
    div.module.roaming-module.wtf-module.js-wtf-module.has-content { display: none; }
    div.Footer.module.roaming-module { display: none; }
    div.ProfileWTFAndTrends { display: none; }
    div.trends-inner { display: none; }
    div.flex-module.import-prompt { display: none; }
}