diff --git a/content/treestyletab/windowHelperHacks.js b/content/treestyletab/windowHelperHacks.js
index 80cff0c8..1f7b52e5 100644
--- a/content/treestyletab/windowHelperHacks.js
+++ b/content/treestyletab/windowHelperHacks.js
@@ -524,6 +524,20 @@ TreeStyleTabWindowHelper.overrideExtensionsAfterBrowserInit = function TSTWH_ove
 		);
 	}
 
+	// DragIt
+	// https://addons.mozilla.org/firefox/addon/dragit-formerly-drag-de-go/
+	if ('DragIt' in window &&
+		DragIt.tab &&
+		DragIt.tab.open &&
+		TreeStyleTabUtils.getTreePref('compatibility.DragIt')) {
+		eval('DragIt.tab.open = '+
+			DragIt.tab.open.toSource().replace(
+				'try {',
+				'try { TreeStyleTabService.readyToOpenChildTabNow(gBrowser);'
+			)
+		);
+	}
+
 	// Colorful Tabs
 	// https://addons.mozilla.org/firefox/addon/1368
 	if ('colorfulTabs' in window &&
diff --git a/defaults/preferences/treestyletab.js b/defaults/preferences/treestyletab.js
index f371e907..669b97d3 100644
--- a/defaults/preferences/treestyletab.js
+++ b/defaults/preferences/treestyletab.js
@@ -637,6 +637,7 @@ pref("extensions.treestyletab.compatibility.Autohide", true);
 pref("extensions.treestyletab.compatibility.ColorfulTabs", true);
 pref("extensions.treestyletab.compatibility.DomainTab", true);
 pref("extensions.treestyletab.compatibility.DragDeGo", true);
+pref("extensions.treestyletab.compatibility.DragIt", true);
 pref("extensions.treestyletab.compatibility.DragNDropToolbars", true);
 pref("extensions.treestyletab.compatibility.DuplicateThisTab", true);
 pref("extensions.treestyletab.compatibility.FirefoxSync", true);
diff --git a/history.en.md b/history.en.md
index 195b1f66..5a1b566e 100644
--- a/history.en.md
+++ b/history.en.md
@@ -2,6 +2,7 @@
 
  - master/HEAD
    * Works on Firefox 25 and later.
+   * Improved: New tab from [DragIt](https://addons.mozilla.org/firefox/addon/dragit-formerly-drag-de-go/) is opened as a child of the current tab.
    * Fixed: Don't shrink tab bar automatically, when the user selects a background tab.
    * Improved: Update label of Firefox's "Close Tabs to the Right" menu item to "Close Tabs to the Bottom" in the vertical tab bar.
    * Fixed: Don't break tree structure by drag and drop of a child tab to move it to the upper level.
diff --git a/history.ja.md b/history.ja.md
index 3e03cc41..ab1ea65d 100644
--- a/history.ja.md
+++ b/history.ja.md
@@ -2,6 +2,7 @@
 
  - master/HEAD
    * Firefox 25に対応
+   * [DragIt](https://addons.mozilla.org/firefox/addon/dragit-formerly-drag-de-go/)から開いたタブを現在のタブの子にするようにした
    * バックグラウンドのタブに切り替えた時に、タブの操作中にもかかわらずタブバーが自動的に折り畳まれる事があったのを修正
    * Firefox自身の「右のタブを閉じる」機能について、メニュー項目のラベルを縦型タブバーでは「下のタブを閉じる」に変えるようにした
    * 子タブをドラッグしてひとつ上のレベルに移動する操作でツリー構造が壊れる場合があったのを修正