diff --git a/background_scripts/commands.js b/background_scripts/commands.js
index 8fa8c29c4..1b278482e 100644
--- a/background_scripts/commands.js
+++ b/background_scripts/commands.js
@@ -346,6 +346,10 @@ const Commands = {
       "removeTab",
       "restoreTab",
       "moveTabToNewWindow",
+      "mergeTabToExistingWindowOnLeft",
+      "mergeTabToExistingWindowOnRight",
+      "mergeTabToExistingWindowAbove",
+      "mergeTabToExistingWindowBelow",
       "closeTabsOnLeft",
       "closeTabsOnRight",
       "closeOtherTabs",
@@ -366,6 +370,10 @@ const Commands = {
     "scrollToLeft",
     "scrollToRight",
     "moveTabToNewWindow",
+    "mergeTabToExistingWindowOnLeft",
+    "mergeTabToExistingWindowOnRight",
+    "mergeTabToExistingWindowAbove",
+    "mergeTabToExistingWindowBelow",
     "goUp",
     "goToRoot",
     "LinkHints.activateModeWithQueue",
@@ -459,6 +467,10 @@ const defaultKeyMappings = {
   "g0": "firstTab",
   "g$": "lastTab",
   "W": "moveTabToNewWindow",
+  "wh": "mergeTabToExistingWindowOnLeft",
+  "wl": "mergeTabToExistingWindowOnRight",
+  "wk": "mergeTabToExistingWindowAbove",
+  "wj": "mergeTabToExistingWindowBelow",
   "t": "createTab",
   "yt": "duplicateTab",
   "x": "removeTab",
@@ -552,6 +564,12 @@ const commandDescriptions = {
   restoreTab: ["Restore closed tab", { background: true, repeatLimit: 20 }],
 
   moveTabToNewWindow: ["Move tab to new window", { background: true }],
+
+  mergeTabToExistingWindowOnLeft : ["Move tab to an existing window on left, if exists", {background: true}],
+  mergeTabToExistingWindowOnRight : ["Move tab to an existing window on right, if exists", {background: true}],
+  mergeTabToExistingWindowAbove : ["Move tab to an existing window above, if exists", {background: true}],
+  mergeTabToExistingWindowBelow : ["Move tab to an existing window below, if exists", {background: true}],
+
   togglePinTab: ["Pin or unpin current tab", { background: true }],
   toggleMuteTab: ["Mute or unmute current tab", { background: true, noRepeat: true }],
 
diff --git a/background_scripts/main.js b/background_scripts/main.js
index 823f50187..133fadf55 100644
--- a/background_scripts/main.js
+++ b/background_scripts/main.js
@@ -210,6 +210,35 @@ function nextZoomLevel(currentZoom, steps) {
   }
 }
 
+const moveTabToExistingWindow = function(orientation, currentTab) {
+  chrome.windows.getCurrent({}, currentWindow => {
+    chrome.windows.getAll({populate: true}, windows => {
+      const filteredWindows = windows.filter(window => {
+        if (window.id !== currentWindow.id) {
+          if (orientation === 'left') {
+            return window.left < currentWindow.left;
+          } else if (orientation === 'right') {
+            return window.left > currentWindow.left;
+          } else if (orientation === 'top') {
+            return window.top < currentWindow.top;
+          } else if (orientation === 'bottom') {
+            return window.top > currentWindow.top;
+          }
+        }
+      });
+      if (filteredWindows.length > 0) {
+        const destinationWindow = filteredWindows[0];
+        chrome.tabs.move(currentTab.id, { windowId: destinationWindow.id, index: -1 }).then(() => {
+          chrome.windows.get(destinationWindow.id, {populate: true}, newWindow => {
+            const newTab = newWindow.tabs.slice(-1)[0];
+            selectSpecificTab({ id: newTab.id });
+          });
+        });
+      }
+    });
+  });
+};
+
 // These are commands which are bound to keystrokes which must be handled by the background page.
 // They are mapped in commands.js.
 const BackgroundCommands = {
@@ -291,6 +320,19 @@ const BackgroundCommands = {
     });
   },
 
+  mergeTabToExistingWindowOnLeft(request) {
+    moveTabToExistingWindow("left", request.tab);
+  },
+  mergeTabToExistingWindowOnRight(request) {
+    moveTabToExistingWindow("right", request.tab);
+  },
+  mergeTabToExistingWindowAbove(request) {
+    moveTabToExistingWindow("top", request.tab);
+  },
+  mergeTabToExistingWindowBelow(request) {
+    moveTabToExistingWindow("bottom", request.tab);
+  },
+
   nextTab(request) {
     return selectTab("next", request);
   },