修改了抓手工具样式适应火狐

src/css/viewer.css

@@ -813,6 +813,13 @@
    transform: scaleX(-1);
  }
  
+.toolbarButton.draggrad::before {
+  content: url(../assets/secondaryToolbarButton-handTool.png);
+}
+html[dir='rtl'] .toolbarButton.draggrad::before {
+  transform: scaleX(-1);
+}
+
  .toolbarButton.pageDown::before {
    content: url(../assets/toolbarButton-pageDown.png);
  }
@@ -888,10 +895,6 @@
    content: url(../assets/toolbarButton-search.png);
  }
 
- #draggrad.toolbarButton::before {
-  content: url(../assets/secondaryToolbarButton-handTool.png);
-}
-
  .toolbarButton.pdfSidebarNotification::after {
    position: absolute;
    display: inline-block;
@@ -1644,7 +1647,15 @@
    html[dir='rtl'] .toolbarButton.pageDown::before {
      transform: scale(-0.5, 0.5);
    }
- 
+
+   .toolbarButton.draggrad::before {
+    content: url(../assets/secondaryToolbarButton-handTool@2x.png);
+  }
+
+  html[dir='rtl'] .toolbarButton.draggrad::before {
+    transform: scale(-0.5, 0.5);
+  }
+
    .toolbarButton.zoomIn::before {
      content: url(../assets/toolbarButton-zoomIn@2x.png);
    }