papirus-icon-theme/Papirus/16x16/actions/tab-new-background.svg

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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
  <defs>
    <style type="text/css" id="current-color-scheme">
      .ColorScheme-Text {
        color:#5c616c;
      }
      </style>
  </defs>
  <path style="fill:currentColor;opacity:0.3" class="ColorScheme-Text" d="M 4 2 C 4 2 2 2 2 4 L 2 11 C 2 12 1 12 1 12 L 0 12 L 0 14 L 16 14 L 16 12 L 15 12 C 15 12 14 12 14 11 L 14 4 C 14 4 14 2 12 2 L 4 2 z M 7 5 L 9 5 L 9 7 L 11 7 L 11 9 L 9 9 L 9 11 L 7 11 L 7 9 L 5 9 L 5 7 L 7 7 L 7 5 z "/>
</svg>