diff --git a/toolkit/mozapps/extensions/XPIProvider.jsm b/toolkit/mozapps/extensions/XPIProvider.jsm
index 649c76688545..8230013ca256 100644
--- a/toolkit/mozapps/extensions/XPIProvider.jsm
+++ b/toolkit/mozapps/extensions/XPIProvider.jsm
@@ -3314,6 +3314,7 @@ AddonInstall.prototype = {
         uri = buildJarURI(this.file, FILE_INSTALL_MANIFEST);
         this.addon = loadManifestFromRDF(uri, bis);
         this.addon._sourceBundle = this.file;
+        this.addon._install = this;
       }
       finally {
         bis.close();
@@ -3597,11 +3598,16 @@ AddonInstall.prototype = {
                                  0);
           converter.init(stream, "UTF-8", 0, 0x0000);
 
-          // A little hacky but we can't (and shouldn't) cache the source bundle.
-          let bundle = this.addon._sourceBundle;
+          // A little hacky but we can't cache certain objects.
+          let objs = {
+            sourceBundle: this.addon._sourceBundle,
+            install: this.addon._install
+          };
           delete this.addon._sourceBundle;
+          delete this.addon._install;
           converter.writeString(json.encode(this.addon));
-          this.addon._sourceBundle = bundle;
+          this.addon._sourceBundle = objs.sourceBundle;
+          this.addon._install = objs.install;
         }
         finally {
           converter.close();
@@ -4072,6 +4078,12 @@ function AddonWrapper(addon) {
     addon.updateAutomatically = val;
   });
 
+  this.__defineGetter__("install", function() {
+    if (!("_install" in addon) || !addon._install)
+      return null;
+    return addon._install.wrapper;
+  });
+
   this.__defineGetter__("pendingUpgrade", function() {
     return createWrapper(addon.pendingUpgrade);
   });
diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_install.js b/toolkit/mozapps/extensions/test/xpcshell/test_install.js
index 75d0f3b4ed2b..90e6d4e5dd5d 100644
--- a/toolkit/mozapps/extensions/test/xpcshell/test_install.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_install.js
@@ -55,6 +55,7 @@ function run_test_1() {
     do_check_eq(install.name, "Test 1");
     do_check_eq(install.state, AddonManager.STATE_DOWNLOADED);
     do_check_true(install.addon.hasResource("install.rdf"));
+    do_check_eq(install.addon.install, install);
 
     let file = do_get_addon("test_install1");
     let uri = Services.io.newFileURI(file).spec;
@@ -172,6 +173,7 @@ function check_test_2(install) {
   do_check_eq(install.version, "2.0");
   do_check_eq(install.name, "Real Test 2");
   do_check_eq(install.state, AddonManager.STATE_DOWNLOADED);
+  do_check_eq(install.addon.install, install);
 
   // Pause the install here and start it again in run_test_3
   do_execute_soon(function() { run_test_3(install); });
@@ -261,6 +263,7 @@ function check_test_4(install) {
   do_check_eq(install.state, AddonManager.STATE_DOWNLOADED);
   do_check_neq(install.existingAddon);
   do_check_eq(install.existingAddon.id, "addon2@tests.mozilla.org");
+  do_check_eq(install.addon.install, install);
 
   run_test_5();
   // Installation will continue when there is nothing returned.
@@ -278,8 +281,11 @@ function run_test_5() {
   ], check_test_5);
 }
 
-function check_test_5() {
+function check_test_5(install) {
   ensure_test_completed();
+
+  do_check_eq(install.existingAddon.pendingUpgrade.install, install);
+
   AddonManager.getAddon("addon2@tests.mozilla.org", function(olda2) {
     do_check_neq(olda2, null);
     do_check_true(hasFlag(olda2.pendingOperations, AddonManager.PENDING_UPGRADE));
diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_update.js b/toolkit/mozapps/extensions/test/xpcshell/test_update.js
index a71d9b6939f1..03b8113be530 100644
--- a/toolkit/mozapps/extensions/test/xpcshell/test_update.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_update.js
@@ -210,6 +210,7 @@ function run_test_4() {
 function continue_test_4(install) {
   do_check_neq(install.existingAddon, null);
   do_check_eq(install.existingAddon.id, "addon1@tests.mozilla.org");
+
   prepare_test({
     "addon1@tests.mozilla.org": [
       "onInstalling"
@@ -220,7 +221,9 @@ function continue_test_4(install) {
   ], check_test_4);
 }
 
-function check_test_4() {
+function check_test_4(install) {
+  do_check_eq(install.existingAddon.pendingUpgrade.install, install);
+
   restartManager(1);
   AddonManager.getAddon("addon1@tests.mozilla.org", function(a1) {
     do_check_neq(a1, null);