--- a/browser/base/content/test/general/browser_bug719271.js
+++ b/browser/base/content/test/general/browser_bug719271.js
@@ -19,16 +19,22 @@ function test() {
     yield FullZoomHelper.load(gTab1, TEST_PAGE);
     yield FullZoomHelper.load(gTab2, TEST_VIDEO);
   }).then(zoomTab1, FullZoomHelper.failAndContinue(finish));
 }
 
 function zoomTab1() {
   Task.spawn(function* () {
     is(gBrowser.selectedTab, gTab1, "Tab 1 is selected");
+
+    //Reset zoom level if we run this test > 1 time in same browser session.
+    var level1 = ZoomManager.getZoomForBrowser(gBrowser.getBrowserForTab(gTab1));
+    if(level1 > 1)
+      FullZoom.reduce();
+
     FullZoomHelper.zoomTest(gTab1, 1, "Initial zoom of tab 1 should be 1");
     FullZoomHelper.zoomTest(gTab2, 1, "Initial zoom of tab 2 should be 1");
 
     FullZoom.enlarge();
     gLevel1 = ZoomManager.getZoomForBrowser(gBrowser.getBrowserForTab(gTab1));
 
     ok(gLevel1 > 1, "New zoom for tab 1 should be greater than 1");
     FullZoomHelper.zoomTest(gTab2, 1, "Zooming tab 1 should not affect tab 2");