--- a/browser/base/content/browser-fullScreenAndPointerLock.js
+++ b/browser/base/content/browser-fullScreenAndPointerLock.js
@@ -291,16 +291,17 @@ var FullScreen = {
       document.getElementById("enterFullScreenItem").hidden = enterFS;
       document.getElementById("exitFullScreenItem").hidden = !enterFS;
     }
 
     if (!this._fullScrToggler) {
       this._fullScrToggler = document.getElementById("fullscr-toggler");
       this._fullScrToggler.addEventListener("mouseover", this._expandCallback);
       this._fullScrToggler.addEventListener("dragenter", this._expandCallback);
+      this._fullScrToggler.addEventListener("touchmove", this._expandCallback, {passive: true});
     }
 
     if (enterFS) {
       gNavToolbox.setAttribute("inFullscreen", true);
       document.documentElement.setAttribute("inFullscreen", true);
       if (!document.fullscreenElement && this.useLionFullScreen)
         document.documentElement.setAttribute("OSXLionFullscreen", true);
     } else {