new file mode 100644
--- /dev/null
+++ b/toolkit/components/telemetry/tests/addons/system/install.rdf
@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+
+<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+     xmlns:em="http://www.mozilla.org/2004/em-rdf#">
+
+  <Description about="urn:mozilla:install-manifest">
+    <em:id>tel-system-xpi@tests.mozilla.org</em:id>
+    <em:version>1.0</em:version>
+
+    <em:targetApplication>
+      <Description>
+        <em:id>toolkit@mozilla.org</em:id>
+        <em:minVersion>0</em:minVersion>
+        <em:maxVersion>*</em:maxVersion>
+      </Description>
+    </em:targetApplication>
+
+    <!-- Front End MetaData -->
+    <em:name>XPI Telemetry System Add-on Test</em:name>
+    <em:description>A system addon which is shipped with Firefox.</em:description>
+    <em:bootstrap>true</em:bootstrap>
+
+  </Description>
+</RDF>

--- a/toolkit/mozapps/extensions/internal/XPIProvider.jsm
+++ b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
@@ -1,9 +1,9 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
+ /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cr = Components.results;
@@ -7132,16 +7132,22 @@ AddonWrapper.prototype = {
     let addon = addonFor(this);
     if (addon._installLocation.name == KEY_APP_TEMPORARY)
       return false;
 
     return (addon._installLocation.name == KEY_APP_SYSTEM_DEFAULTS ||
             addon._installLocation.name == KEY_APP_SYSTEM_ADDONS);
   },
 
+  get isSystem() {
+    let addon = addonFor(this);
+    return (addon._installLocation.name == KEY_APP_SYSTEM_DEFAULTS ||
+            addon._installLocation.name == KEY_APP_SYSTEM_ADDONS);
+  },
+
   isCompatibleWith: function(aAppVersion, aPlatformVersion) {
     return addonFor(this).isCompatibleWith(aAppVersion, aPlatformVersion);
   },
 
   uninstall: function(alwaysAllowUndo) {
     let addon = addonFor(this);
     XPIProvider.uninstallAddon(addon, alwaysAllowUndo);
   },

--- a/toolkit/mozapps/extensions/test/xpcshell/test_bootstrap.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_bootstrap.js
@@ -180,16 +180,17 @@ function check_test_1(installSyncGUID) {
     AddonManager.getAddonByID(ID1, function(b1) {
       do_check_neq(b1, null);
       do_check_eq(b1.version, "1.0");
       do_check_neq(b1.syncGUID, null);
       do_check_eq(b1.syncGUID, installSyncGUID);
       do_check_false(b1.appDisabled);
       do_check_false(b1.userDisabled);
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
       BootstrapMonitor.checkAddonStarted(ID1, "1.0");
       do_check_eq(getStartupReason(), ADDON_INSTALL);
       do_check_eq(getStartupOldVersion(), undefined);
       do_check_true(b1.hasResource("install.rdf"));
       do_check_true(b1.hasResource("bootstrap.js"));
       do_check_false(b1.hasResource("foo.bar"));
       do_check_in_crash_annotation(ID1, "1.0");
@@ -286,16 +287,17 @@ function run_test_4() {
     b1.userDisabled = false;
     ensure_test_completed();
 
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_eq(getStartupReason(), ADDON_ENABLE);
     do_check_eq(getStartupOldVersion(), undefined);
     do_check_in_crash_annotation(ID1, "1.0");
 
     AddonManager.getAddonByID(ID1, function(newb1) {
       do_check_neq(newb1, null);
@@ -328,16 +330,17 @@ function run_test_5() {
   do_check_in_crash_annotation(ID1, "1.0");
 
   AddonManager.getAddonByID(ID1, function(b1) {
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     do_check_false(isExtensionInAddonsList(profileDir, b1.id));
 
     do_check_bootstrappedPref(run_test_6);
   });
 }
 
 // Tests that installing an upgrade doesn't require a restart
 function run_test_6() {
@@ -371,16 +374,17 @@ function run_test_6() {
 
 function check_test_6() {
   AddonManager.getAddonByID(ID1, function(b1) {
     do_check_neq(b1, null);
     do_check_eq(b1.version, "2.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     BootstrapMonitor.checkAddonInstalled(ID1, "2.0");
     BootstrapMonitor.checkAddonStarted(ID1, "2.0");
     do_check_eq(getStartupReason(), ADDON_UPGRADE);
     do_check_eq(getInstallOldVersion(), 1);
     do_check_eq(getStartupOldVersion(), 1);
     do_check_eq(getShutdownReason(), ADDON_UPGRADE);
     do_check_eq(getShutdownNewVersion(), 2);
     do_check_eq(getUninstallNewVersion(), 2);
@@ -441,16 +445,17 @@ function run_test_8() {
   startupManager(false);
 
   AddonManager.getAddonByID(ID1, function(b1) {
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_eq(getStartupReason(), ADDON_INSTALL);
     do_check_eq(getStartupOldVersion(), undefined);
     do_check_in_crash_annotation(ID1, "1.0");
 
     do_check_bootstrappedPref(run_test_9);
   });
@@ -511,16 +516,17 @@ function run_test_10() {
 
 function check_test_10_pt1() {
   AddonManager.getAddonByID(ID1, function(b1) {
     do_check_neq(b1, null);
     do_check_eq(b1.version, "2.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     BootstrapMonitor.checkAddonInstalled(ID1, "2.0");
     BootstrapMonitor.checkAddonStarted(ID1, "2.0");
     do_check_eq(getStartupReason(), ADDON_INSTALL);
     do_check_eq(getStartupOldVersion(), undefined);
     do_check_true(b1.hasResource("install.rdf"));
     do_check_true(b1.hasResource("bootstrap.js"));
     do_check_false(b1.hasResource("foo.bar"));
     do_check_in_crash_annotation(ID1, "2.0");
@@ -555,16 +561,17 @@ function check_test_10_pt1() {
 
 function check_test_10_pt2() {
   AddonManager.getAddonByID(ID1, function(b1) {
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_eq(getStartupReason(), ADDON_DOWNGRADE);
     do_check_eq(getInstallOldVersion(), 2);
     do_check_eq(getStartupOldVersion(), 2);
     do_check_eq(getShutdownReason(), ADDON_DOWNGRADE);
     do_check_eq(getShutdownNewVersion(), 1);
     do_check_eq(getUninstallNewVersion(), 1);
@@ -621,16 +628,17 @@ function run_test_12() {
   startupManager(true);
 
   AddonManager.getAddonByID(ID1, function(b1) {
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_false(b1.appDisabled);
     do_check_false(b1.userDisabled);
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_eq(getStartupReason(), ADDON_INSTALL);
     do_check_eq(getStartupOldVersion(), undefined);
     do_check_in_crash_annotation(ID1, "1.0");
 
     b1.uninstall();
     do_execute_soon(test_12_restart);
@@ -749,16 +757,17 @@ function run_test_14() {
 function run_test_15() {
   BootstrapMonitor.promiseAddonStartup(ID1).then(function test_15_after_startup() {
     AddonManager.getAddonByID(ID1, function(b1) {
       do_check_neq(b1, null);
       do_check_eq(b1.version, "1.0");
       do_check_false(b1.appDisabled);
       do_check_false(b1.userDisabled);
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
       BootstrapMonitor.checkAddonStarted(ID1, "1.0");
 
       b1.userDisabled = true;
       do_check_false(b1.isActive);
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
       BootstrapMonitor.checkAddonNotStarted(ID1);
 
@@ -821,16 +830,17 @@ function check_test_15() {
 // Tests that bootstrapped extensions don't get loaded when in safe mode
 function run_test_16() {
   BootstrapMonitor.promiseAddonStartup(ID1).then(function test_16_after_startup() {
     AddonManager.getAddonByID(ID1, callback_soon(function(b1) {
       // Should have installed and started
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
       BootstrapMonitor.checkAddonStarted(ID1, "1.0");
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
       do_check_eq(b1.iconURL, "chrome://foo/skin/icon.png");
       do_check_eq(b1.aboutURL, "chrome://foo/content/about.xul");
       do_check_eq(b1.optionsURL, "chrome://foo/content/options.xul");
 
       shutdownManager();
 
       // Should have stopped
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
@@ -878,32 +888,34 @@ function run_test_17() {
 
   AddonManager.getAddonByID(ID1, function(b1) {
     // Should have installed and started
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
 
     do_check_bootstrappedPref(run_test_18);
   });
 }
 
 // Check that installing a new bootstrapped extension in the profile replaces
 // the existing one
 function run_test_18() {
   BootstrapMonitor.promiseAddonStartup(ID1).then(function test_18_after_startup() {
     AddonManager.getAddonByID(ID1, function(b1) {
       // Should have installed and started
       BootstrapMonitor.checkAddonInstalled(ID1, "2.0");
       BootstrapMonitor.checkAddonStarted(ID1, "2.0");
       do_check_neq(b1, null);
       do_check_eq(b1.version, "2.0");
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
 
       do_check_eq(getShutdownReason(), ADDON_UPGRADE);
       do_check_eq(getUninstallReason(), ADDON_UPGRADE);
       do_check_eq(getInstallReason(), ADDON_UPGRADE);
       do_check_eq(getStartupReason(), ADDON_UPGRADE);
 
       do_check_eq(getShutdownNewVersion(), 2);
       do_check_eq(getUninstallNewVersion(), 2);
@@ -936,16 +948,17 @@ function run_test_19() {
 function check_test_19() {
   AddonManager.getAddonByID(ID1, function(b1) {
     // Should have reverted to the older version
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
 
     // TODO these reasons really should be ADDON_DOWNGRADE (bug 607818)
     do_check_eq(getShutdownReason(), ADDON_UNINSTALL);
     do_check_eq(getUninstallReason(), ADDON_UNINSTALL);
     do_check_eq(getInstallReason(), ADDON_INSTALL);
     do_check_eq(getStartupReason(), ADDON_INSTALL);
 
     do_check_eq(getShutdownNewVersion(), undefined);
@@ -969,16 +982,17 @@ function run_test_20() {
 
   AddonManager.getAddonByID(ID1, function(b1) {
     // Should have installed and started
     BootstrapMonitor.checkAddonInstalled(ID1, "2.0");
     BootstrapMonitor.checkAddonStarted(ID1, "2.0");
     do_check_neq(b1, null);
     do_check_eq(b1.version, "2.0");
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
 
     do_check_eq(getShutdownReason(), APP_SHUTDOWN);
     do_check_eq(getUninstallReason(), ADDON_UPGRADE);
     do_check_eq(getInstallReason(), ADDON_UPGRADE);
     do_check_eq(getStartupReason(), APP_STARTUP);
 
     do_check_eq(getShutdownNewVersion(), undefined);
     do_check_eq(getUninstallNewVersion(), 2);
@@ -1003,16 +1017,17 @@ function run_test_21() {
 
   AddonManager.getAddonByID(ID1, function(b1) {
     // Should have installed and started
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
 
     // This won't be set as the bootstrap script was gone so we couldn't
     // uninstall it properly
     do_check_eq(getUninstallReason(), undefined);
     do_check_eq(getUninstallNewVersion(), undefined);
 
     do_check_eq(getInstallReason(), ADDON_DOWNGRADE);
     do_check_eq(getInstallOldVersion(), 2);
@@ -1046,16 +1061,17 @@ function run_test_22() {
 
   AddonManager.getAddonByID(ID1, callback_soon(function(b1) {
     // Should have installed and started
     BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
     BootstrapMonitor.checkAddonStarted(ID1, "1.0");
     do_check_neq(b1, null);
     do_check_eq(b1.version, "1.0");
     do_check_true(b1.isActive);
+    do_check_false(b1.isSystem);
 
     shutdownManager();
 
     do_check_eq(getShutdownReason(), APP_SHUTDOWN);
     do_check_eq(getShutdownNewVersion(), undefined);
 
     manuallyUninstall(profileDir, ID1);
     BootstrapMonitor.clear(ID1);
@@ -1066,16 +1082,17 @@ function run_test_22() {
 
     AddonManager.getAddonByID(ID1, function(b1) {
       // Should have installed and started
       BootstrapMonitor.checkAddonInstalled(ID1, "2.0");
       BootstrapMonitor.checkAddonStarted(ID1, "2.0");
       do_check_neq(b1, null);
       do_check_eq(b1.version, "2.0");
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
 
       // This won't be set as the bootstrap script was gone so we couldn't
       // uninstall it properly
       do_check_eq(getUninstallReason(), undefined);
       do_check_eq(getUninstallNewVersion(), undefined);
 
       do_check_eq(getInstallReason(), ADDON_UPGRADE);
       do_check_eq(getInstallOldVersion(), 1);
@@ -1145,16 +1162,17 @@ function check_test_23() {
 
     AddonManager.getAddonByID(ID1, function(b1) {
      do_execute_soon(function test_23_after_startup() {
       do_check_neq(b1, null);
       do_check_eq(b1.version, "1.0");
       do_check_false(b1.appDisabled);
       do_check_false(b1.userDisabled);
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
       BootstrapMonitor.checkAddonStarted(ID1, "1.0");
       do_check_eq(getStartupReason(), ADDON_INSTALL);
       do_check_eq(getStartupOldVersion(), undefined);
       do_check_true(b1.hasResource("install.rdf"));
       do_check_true(b1.hasResource("bootstrap.js"));
       do_check_false(b1.hasResource("foo.bar"));
       do_check_in_crash_annotation(ID1, "1.0");
@@ -1233,29 +1251,31 @@ function run_test_25() {
         // Needs a restart to complete this so the old version stays running
         BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
         BootstrapMonitor.checkAddonStarted(ID1, "1.0");
 
         AddonManager.getAddonByID(ID1, callback_soon(function(b1) {
           do_check_neq(b1, null);
           do_check_eq(b1.version, "1.0");
           do_check_true(b1.isActive);
+          do_check_false(b1.isSystem);
           do_check_true(hasFlag(b1.pendingOperations, AddonManager.PENDING_UPGRADE));
 
           restartManager();
 
           BootstrapMonitor.checkAddonNotInstalled(ID1);
           do_check_eq(getUninstallReason(), ADDON_UPGRADE);
           do_check_eq(getUninstallNewVersion(), 4);
           BootstrapMonitor.checkAddonNotStarted(ID1);
 
           AddonManager.getAddonByID(ID1, function(b1) {
             do_check_neq(b1, null);
             do_check_eq(b1.version, "4.0");
             do_check_true(b1.isActive);
+            do_check_false(b1.isSystem);
             do_check_eq(b1.pendingOperations, AddonManager.PENDING_NONE);
 
             do_check_bootstrappedPref(run_test_26);
           });
         }));
       });
   });
   installAllFiles([do_get_addon("test_bootstrap1_1")], function test_25_installed() {
@@ -1270,29 +1290,31 @@ function run_test_26() {
     // Needs a restart to complete this
     BootstrapMonitor.checkAddonNotInstalled(ID1);
     BootstrapMonitor.checkAddonNotStarted(ID1);
 
     AddonManager.getAddonByID(ID1, callback_soon(function(b1) {
       do_check_neq(b1, null);
       do_check_eq(b1.version, "4.0");
       do_check_true(b1.isActive);
+      do_check_false(b1.isSystem);
       do_check_true(hasFlag(b1.pendingOperations, AddonManager.PENDING_UPGRADE));
 
       restartManager();
 
       BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
       do_check_eq(getInstallReason(), ADDON_DOWNGRADE);
       do_check_eq(getInstallOldVersion(), 4);
       BootstrapMonitor.checkAddonStarted(ID1, "1.0");
 
       AddonManager.getAddonByID(ID1, function(b1) {
         do_check_neq(b1, null);
         do_check_eq(b1.version, "1.0");
         do_check_true(b1.isActive);
+        do_check_false(b1.isSystem);
         do_check_eq(b1.pendingOperations, AddonManager.PENDING_NONE);
 
         do_check_bootstrappedPref(run_test_27);
       });
     }));
   });
 }
 
@@ -1363,16 +1385,17 @@ function run_test_28() {
       BootstrapMonitor.checkAddonNotStarted(ID1);
 
       AddonManager.getAddonByID(ID1, function(b1) {
         do_check_neq(b1, null);
         do_check_true(b1.userDisabled);
         b1.userDisabled = false;
         do_check_eq(b1.version, "1.0");
         do_check_true(b1.isActive);
+        do_check_false(b1.isSystem);
         do_check_eq(b1.pendingOperations, AddonManager.PENDING_NONE);
         BootstrapMonitor.checkAddonInstalled(ID1, "1.0");
         BootstrapMonitor.checkAddonStarted(ID1, "1.0");
 
         do_check_bootstrappedPref(do_test_finished);
       });
     }));
    });

--- a/toolkit/mozapps/extensions/test/xpcshell/test_system_reset.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_system_reset.js
@@ -41,16 +41,17 @@ function* check_installed(inProfile, ...
       // Add-on should be installed
       do_check_neq(addon, null);
       do_check_eq(addon.version, versions[i]);
       do_check_true(addon.isActive);
       do_check_false(addon.foreignInstall);
       do_check_false(hasFlag(addon.permissions, AddonManager.PERM_CAN_UPGRADE));
       do_check_false(hasFlag(addon.permissions, AddonManager.PERM_CAN_UNINSTALL));
       do_check_true(addon.hidden);
+      do_check_true(addon.isSystem);
 
       // Verify the add-ons file is in the right place
       let file = expectedDir.clone();
       file.append(id + ".xpi");
       do_check_true(file.exists());
       do_check_true(file.isFile());
 
       let uri = addon.getResourceURI(null);

--- a/toolkit/mozapps/extensions/test/xpcshell/test_system_update.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_system_update.js
@@ -157,16 +157,17 @@ function* check_installed(inProfile, ...
       do_print(`Checking state of add-on ${id}, expecting version ${versions[i]}`);
 
       // Add-on should be installed
       do_check_neq(addon, null);
       do_check_eq(addon.version, versions[i]);
       do_check_true(addon.isActive);
       do_check_false(addon.foreignInstall);
       do_check_true(addon.hidden);
+      do_check_true(addon.isSystem);
 
       // Verify the add-ons file is in the right place
       let file = expectedDir.clone();
       file.append(id + ".xpi");
       do_check_true(file.exists());
       do_check_true(file.isFile());
 
       let uri = addon.getResourceURI(null);

--- a/toolkit/mozapps/extensions/test/xpcshell/test_webextension.js
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_webextension.js
@@ -49,16 +49,17 @@ add_task(function*() {
 
   let addon = yield promiseAddonByID(ID);
   do_check_neq(addon, null);
   do_check_eq(addon.version, "1.0");
   do_check_eq(addon.name, "Web Extension Name");
   do_check_true(addon.isCompatible);
   do_check_false(addon.appDisabled);
   do_check_true(addon.isActive);
+  do_check_false(addon.isSystem);
   do_check_eq(addon.type, "extension");
   do_check_eq(addon.signedState, mozinfo.addon_signing ? AddonManager.SIGNEDSTATE_SIGNED : AddonManager.SIGNEDSTATE_NOT_REQUIRED);
 
   let uri = do_get_addon_root_uri(profileDir, ID);
 
   do_check_eq(addon.iconURL, uri + "icon48.png");
   do_check_eq(addon.icon64URL, uri + "icon64.png");
 
@@ -76,16 +77,17 @@ add_task(function*() {
 
   addon = yield promiseAddonByID(ID);
   do_check_neq(addon, null);
   do_check_eq(addon.version, "1.0");
   do_check_eq(addon.name, "Web Extension Name");
   do_check_true(addon.isCompatible);
   do_check_false(addon.appDisabled);
   do_check_true(addon.isActive);
+  do_check_false(addon.isSystem);
   do_check_eq(addon.type, "extension");
   do_check_eq(addon.signedState, mozinfo.addon_signing ? AddonManager.SIGNEDSTATE_SIGNED : AddonManager.SIGNEDSTATE_NOT_REQUIRED);
 
   let file = getFileForAddon(profileDir, ID);
   do_check_true(file.exists());
 
   uri = do_get_addon_root_uri(profileDir, ID);
 
@@ -129,16 +131,17 @@ add_task(function*() {
 
   let addon = yield promiseAddonByID(ID);
   do_check_neq(addon, null);
   do_check_eq(addon.version, "1.0");
   do_check_eq(addon.name, "Web Extension Name");
   do_check_true(addon.isCompatible);
   do_check_false(addon.appDisabled);
   do_check_true(addon.isActive);
+  do_check_false(addon.isSystem);
   do_check_eq(addon.type, "extension");
   do_check_eq(addon.signedState, mozinfo.addon_signing ? AddonManager.SIGNEDSTATE_SIGNED : AddonManager.SIGNEDSTATE_NOT_REQUIRED);
 
   let file = getFileForAddon(profileDir, ID);
   do_check_true(file.exists());
 
   addon.uninstall();
 
@@ -247,15 +250,16 @@ add_task(function*() {
 
   yield promiseRestartManager();
 
   let installrdf_id = "first-webextension2@tests.mozilla.org";
   let first_addon = yield promiseAddonByID(installrdf_id);
   do_check_neq(first_addon, null);
   do_check_false(first_addon.appDisabled);
   do_check_true(first_addon.isActive);
+  do_check_false(first_addon.isSystem);
 
   let manifestjson_id= "last-webextension2@tests.mozilla.org";
   let last_addon = yield promiseAddonByID(manifestjson_id);
   do_check_eq(last_addon, null);
 
   yield promiseRestartManager();
 });