diff --git a/kasmweb/core/input/mouse.js b/kasmweb/core/input/mouse.js
index 15a54ee..d479d5c 100644
--- a/kasmweb/core/input/mouse.js
+++ b/kasmweb/core/input/mouse.js
@@ -37,7 +37,8 @@ export default class Mouse {
 
         // ===== PROPERTIES =====
 
-        this.touchButton = 1;                 // Button mask (1, 2, 4) for touch devices (0 means ignore clicks)
+        this.touchButton = 1; // Button mask (1, 2, 4) for touch devices
+                              // (0 means ignore clicks)
 
         // ===== EVENT HANDLERS =====
 
@@ -75,14 +76,16 @@ export default class Mouse {
                     const ys = this._lastTouchPos.y - pos.y;
                     const d = Math.sqrt((xs * xs) + (ys * ys));
 
-                    // The goal is to trigger on a certain physical width, the
-                    // devicePixelRatio brings us a bit closer but is not optimal.
+                    // The goal is to trigger on a certain physical width,
+                    // the devicePixelRatio brings us a bit closer but is
+                    // not optimal.
                     const threshold = 20 * (window.devicePixelRatio || 1);
                     if (d < threshold) {
                         pos = this._lastTouchPos;
                     }
                 }
-                this._doubleClickTimer = setTimeout(this._resetDoubleClickTimer.bind(this), 500);
+                this._doubleClickTimer =
+                    setTimeout(this._resetDoubleClickTimer.bind(this), 500);
             }
             bmask = this.touchButton;
             // If bmask is set
@@ -252,39 +255,42 @@ export default class Mouse {
     // ===== PUBLIC METHODS =====
 
     grab() {
+        const t = this._target;
         if (isTouchDevice) {
-            this._target.addEventListener('touchstart', this._eventHandlers.mousedown);
-            this._target.addEventListener('touchend', this._eventHandlers.mouseup);
-            this._target.addEventListener('touchmove', this._eventHandlers.mousemove);
+            t.addEventListener('touchstart', this._eventHandlers.mousedown);
+            t.addEventListener('touchend', this._eventHandlers.mouseup);
+            t.addEventListener('touchmove', this._eventHandlers.mousemove);
         }
-        this._target.addEventListener('mousedown', this._eventHandlers.mousedown);
-        this._target.addEventListener('mouseup', this._eventHandlers.mouseup);
-        this._target.addEventListener('mousemove', this._eventHandlers.mousemove);
-        this._target.addEventListener('wheel', this._eventHandlers.mousewheel);
+        t.addEventListener('mousedown', this._eventHandlers.mousedown);
+        t.addEventListener('mouseup', this._eventHandlers.mouseup);
+        t.addEventListener('mousemove', this._eventHandlers.mousemove);
+        t.addEventListener('wheel', this._eventHandlers.mousewheel);
 
-        /* Prevent middle-click pasting (see above for why we bind to document) */
+        // Prevent middle-click pasting (see above for why we bind to document)
         document.addEventListener('click', this._eventHandlers.mousedisable);
 
-        /* preventDefault() on mousedown doesn't stop this event for some
-           reason so we have to explicitly block it */
-        this._target.addEventListener('contextmenu', this._eventHandlers.mousedisable);
+        // preventDefault() on mousedown doesn't stop this event for some
+        // reason so we have to explicitly block it
+        t.addEventListener('contextmenu', this._eventHandlers.mousedisable);
     }
 
     ungrab() {
+        const t = this._target;
+
         this._resetWheelStepTimers();
 
         if (isTouchDevice) {
-            this._target.removeEventListener('touchstart', this._eventHandlers.mousedown);
-            this._target.removeEventListener('touchend', this._eventHandlers.mouseup);
-            this._target.removeEventListener('touchmove', this._eventHandlers.mousemove);
+            t.removeEventListener('touchstart', this._eventHandlers.mousedown);
+            t.removeEventListener('touchend', this._eventHandlers.mouseup);
+            t.removeEventListener('touchmove', this._eventHandlers.mousemove);
         }
-        this._target.removeEventListener('mousedown', this._eventHandlers.mousedown);
-        this._target.removeEventListener('mouseup', this._eventHandlers.mouseup);
-        this._target.removeEventListener('mousemove', this._eventHandlers.mousemove);
-        this._target.removeEventListener('wheel', this._eventHandlers.mousewheel);
+        t.removeEventListener('mousedown', this._eventHandlers.mousedown);
+        t.removeEventListener('mouseup', this._eventHandlers.mouseup);
+        t.removeEventListener('mousemove', this._eventHandlers.mousemove);
+        t.removeEventListener('wheel', this._eventHandlers.mousewheel);
 
         document.removeEventListener('click', this._eventHandlers.mousedisable);
 
-        this._target.removeEventListener('contextmenu', this._eventHandlers.mousedisable);
+        t.removeEventListener('contextmenu', this._eventHandlers.mousedisable);
     }
 }