Can't import some type of Mozilla format

[Hamayama]

There is no error message but nothing is imported.

• Type A : an extra comma after the last url-prefix

  @-moz-document
      url-prefix("https://www.google.com/webhp"),
      url-prefix("https://www.google.com/search"),
  {
  body {
      background: #FAFAFA !important;
  }
  }
  

• Type B : three comments at the beginning of CSS

  @-moz-document
      url-prefix("https://www.google.com/webhp"),
      url-prefix("https://www.google.com/search")
  {
  /* comment1 */
  /* comment2 */
  /* comment3 */
  body {
      background: #FAFAFA !important;
  }
  }