diff --git a/browser/base/content/test/tabview/Makefile.in b/browser/base/content/test/tabview/Makefile.in
index 40cca03069a8..fb3bc52b6406 100644
--- a/browser/base/content/test/tabview/Makefile.in
+++ b/browser/base/content/test/tabview/Makefile.in
@@ -110,7 +110,6 @@ _BROWSER_FILES = \
                  browser_tabview_bug625195.js \
                  browser_tabview_bug625269.js \
                  browser_tabview_bug625424.js \
-                 browser_tabview_bug625666.js \
                  browser_tabview_bug626368.js \
                  browser_tabview_bug626525.js \
                  browser_tabview_bug626791.js \
diff --git a/browser/base/content/test/tabview/browser_tabview_bug625666.js b/browser/base/content/test/tabview/browser_tabview_bug625666.js
deleted file mode 100644
index a1ba7b883d17..000000000000
--- a/browser/base/content/test/tabview/browser_tabview_bug625666.js
+++ /dev/null
@@ -1,49 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-function test() {
-  let cw;
-
-  let getTabItemAspect = function (tabItem) {
-    let bounds = cw.iQ('.thumb', tabItem.container).bounds();
-    let padding = cw.TabItems.tabItemPadding;
-    return (bounds.height + padding.y) / (bounds.width + padding.x);
-  }
-
-  let getAspectRange = function () {
-    let aspect = cw.TabItems.tabAspect;
-    let variance = aspect / 100 * 1.5;
-    return new cw.Range(aspect - variance, aspect + variance);
-  }
-
-  waitForExplicitFinish();
-
-  newWindowWithTabView(function (win) {
-    registerCleanupFunction(function () win.close());
-    cw = win.TabView.getContentWindow();
-
-    // prepare orphan tab
-    let tabItem = win.gBrowser.tabs[0]._tabViewTabItem;
-    tabItem.parent.remove(tabItem, {immediately: true});
-    tabItem.setBounds(new cw.Rect(20, 20, 200, 165), true);
-
-    let bounds = tabItem.getBounds();
-
-    // prepare group item
-    let box = new cw.Rect(20, 300, 400, 200);
-    let groupItem = new cw.GroupItem([], {bounds: box, immediately: true});
-
-    groupItem.setBounds(new cw.Rect(20, 100, 400, 200));
-    groupItem.pushAway(true);
-
-    let newBounds = tabItem.getBounds();
-    ok(newBounds.width < bounds.width, "The new width of item is smaller than the old one.");
-    ok(newBounds.height < bounds.height, "The new height of item is smaller than the old one.");
-
-    let aspectRange = getAspectRange();
-    let aspect = getTabItemAspect(tabItem);
-    ok(aspectRange.contains(aspect), "orphaned tabItem's aspect is correct");
-
-    finish();
-  });
-}