--- a/browser/components/preferences/in-content-old/search.js
+++ b/browser/components/preferences/in-content-old/search.js
@@ -261,18 +261,20 @@ var gSearchPane = {
       let eduplicate = false;
       let dupName = "";
 
       // Check for duplicates in Places keywords.
       let bduplicate = !!(await PlacesUtils.keywords.fetch(keyword));
 
       // Check for duplicates in changes we haven't committed yet
       let engines = gEngineView._engineStore.engines;
+      let lc_keyword = keyword.toLocaleLowerCase();
       for (let engine of engines) {
-        if (engine.alias == keyword &&
+        if (engine.alias &&
+            engine.alias.toLocaleLowerCase() == lc_keyword &&
             engine.name != aEngine.name) {
           eduplicate = true;
           dupName = engine.name;
           break;
         }
       }
 
       // Notify the user if they have chosen an existing engine/bookmark keyword

--- a/browser/components/preferences/in-content/main.js
+++ b/browser/components/preferences/in-content/main.js
@@ -1040,18 +1040,20 @@ var gMainPane = {
       let eduplicate = false;
       let dupName = "";
 
       // Check for duplicates in Places keywords.
       let bduplicate = !!(await PlacesUtils.keywords.fetch(keyword));
 
       // Check for duplicates in changes we haven't committed yet
       let engines = gEngineView._engineStore.engines;
+      let lc_keyword = keyword.toLocaleLowerCase();
       for (let engine of engines) {
-        if (engine.alias == keyword &&
+        if (engine.alias &&
+            engine.alias.toLocaleLowerCase() == lc_keyword &&
             engine.name != aEngine.name) {
           eduplicate = true;
           dupName = engine.name;
           break;
         }
       }
 
       // Notify the user if they have chosen an existing engine/bookmark keyword

--- a/browser/components/preferences/in-content/tests/browser.ini
+++ b/browser/components/preferences/in-content/tests/browser.ini
@@ -13,16 +13,17 @@ skip-if = !updater
 [browser_bug410900.js]
 [browser_bug705422.js]
 [browser_bug731866.js]
 [browser_search_within_preferences.js]
 [browser_bug795764_cachedisabled.js]
 [browser_bug1018066_resetScrollPosition.js]
 [browser_bug1020245_openPreferences_to_paneContent.js]
 [browser_bug1184989_prevent_scrolling_when_preferences_flipped.js]
+[browser_engines.js]
 support-files =
   browser_bug1184989_prevent_scrolling_when_preferences_flipped.xul
 [browser_change_app_handler.js]
 skip-if = os != "win" # This test tests the windows-specific app selection dialog, so can't run on non-Windows
 [browser_checkspelling.js]
 [browser_connection.js]
 [browser_connection_bug388287.js]
 [browser_cookies_exceptions.js]

new file mode 100644
--- /dev/null
+++ b/browser/components/preferences/in-content/tests/browser_engines.js
@@ -0,0 +1,26 @@
+// Test Engine list
+add_task(async function() {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("general-search", {leaveOpen: true});
+  is(prefs.selectedPane, "paneGeneral", "General pane is selected by default");
+  let doc = gBrowser.contentDocument;
+
+  let tree = doc.querySelector("#engineList");
+  ok(!tree.hidden, "The search engine list should be visible when Search is requested");
+
+  // Check for default search engines to be displayed in the engineList
+  let defaultEngines = Services.search.getDefaultEngines();
+  for (let i = 0; i < defaultEngines.length; i++) {
+      let engine = defaultEngines[i];
+      let cellName = tree.view.getCellText(i, tree.columns.getNamedColumn("engineName"));
+      is(cellName, engine.name, "Default search engine " + engine.name + " displayed correctly");
+  }
+
+  // Avoid duplicated keywords
+  tree.view.setCellText(0, tree.columns.getNamedColumn("engineKeyword"), "keyword");
+  tree.view.setCellText(1, tree.columns.getNamedColumn("engineKeyword"), "keyword");
+  let cellKeyword = tree.view.getCellText(1, tree.columns.getNamedColumn("engineKeyword"));
+  isnot(cellKeyword, "keyword", "Do not allow duplicated keywords");
+
+  await BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+