diff --git a/browser/base/content/browser-addons.js b/browser/base/content/browser-addons.js
index 6f721f6e5169..4132cf84b1a5 100644
--- a/browser/base/content/browser-addons.js
+++ b/browser/base/content/browser-addons.js
@@ -54,6 +54,22 @@ const gXPInstallObserver = {
       // originatingURI might be missing or 'host' might throw for non-nsStandardURL nsIURIs.
     }
 
+    let cancelInstallation = () => {
+      if (installInfo) {
+        for (let install of installInfo.installs)
+          install.cancel();
+      }
+
+      if (aTopic == "addon-install-confirmation")
+        this.acceptInstallation = null;
+
+      let tab = gBrowser.getTabForBrowser(browser);
+      if (tab)
+        tab.removeEventListener("TabClose", cancelInstallation);
+
+      window.removeEventListener("unload", cancelInstallation);
+    };
+
     switch (aTopic) {
     case "addon-install-disabled": {
       notificationID = "xpinstall-disabled";
@@ -170,11 +186,7 @@ const gXPInstallObserver = {
       options.eventCallback = (aEvent) => {
         switch (aEvent) {
           case "removed":
-            if (installInfo) {
-              for (let install of installInfo.installs)
-                install.cancel();
-            }
-            this.acceptInstallation = null;
+            cancelInstallation();
             break;
           case "shown":
             let addonList = document.getElementById("addon-install-confirmation-content");
@@ -247,8 +259,12 @@ const gXPInstallObserver = {
 
       let showNotification = () => {
         let tab = gBrowser.getTabForBrowser(browser);
-        if (tab)
+        if (tab) {
           gBrowser.selectedTab = tab;
+          tab.addEventListener("TabClose", cancelInstallation);
+        }
+
+        window.addEventListener("unload", cancelInstallation);
 
         if (PopupNotifications.isPanelOpen) {
           let rect = document.getElementById("addon-progress-notification").getBoundingClientRect();
diff --git a/browser/base/content/test/general/browser_bug553455.js b/browser/base/content/test/general/browser_bug553455.js
index 69dc63058f80..e0560b751de3 100644
--- a/browser/base/content/test/general/browser_bug553455.js
+++ b/browser/base/content/test/general/browser_bug553455.js
@@ -620,6 +620,35 @@ function test_localfile() {
   gBrowser.loadURI(path);
 },
 
+function test_tabclose() {
+  if (!Preferences.get("xpinstall.customConfirmationUI", false)) {
+    runNextTest();
+    return;
+  }
+
+  // Wait for the progress notification
+  wait_for_progress_notification(aPanel => {
+    // Wait for the install confirmation dialog
+    wait_for_install_dialog(() => {
+      AddonManager.getAllInstalls(aInstalls => {
+        is(aInstalls.length, 1, "Should be one pending install");
+
+        wait_for_notification_close(() => {
+          AddonManager.getAllInstalls(aInstalls => {
+            is(aInstalls.length, 0, "Should be no pending install since the tab is closed");
+            runNextTest();
+          });
+        });
+
+        gBrowser.removeTab(gBrowser.selectedTab);
+      });
+    });
+  });
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.loadURI(TESTROOT + "unsigned.xpi");
+},
+
 function test_wronghost() {
   gBrowser.selectedTab = gBrowser.addTab();
   gBrowser.addEventListener("load", function() {