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

@-moz-document domain("movatwitter.jp"),
               domain("tw.f-shin.net") {

/*アバター非表示*/
img[src*="http://s3.amazonaws.com/twitter_production/profile_images/"] {
display: none !important;
}
img[src*="http://static.twitter.com/images/"] {
display: none !important;
}
}