diff --git a/src/Dock.js b/src/Dock.js
index c628f7f..b9cbe50 100644
--- a/src/Dock.js
+++ b/src/Dock.js
@@ -395,10 +395,12 @@ export default class Dock extends Component {
 
   handleMouseDown = () => {
     this.setState({ isResizing: true });
+    document.body.style.MozUserSelect = 'none';
   }
 
   handleMouseUp = () => {
     this.setState({ isResizing: false });
+    document.body.style.MozUserSelect = 'auto';
   }
 
   handleMouseMove = e => {