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diff --git a/browser/base/content/test/general/browser_bug1261299.js b/browser/base/content/test/general/browser_bug1261299.js
new file mode 100644
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+++ b/browser/base/content/test/general/browser_bug1261299.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* 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/. */
+
+/**
+ * Tests for Bug 1261299
+ * Test that the service menu code path is called properly and the
+ * current selection (transferable) is cached properly on the parent process.
+ */
+
+add_task(async function test_content_and_chrome_selection() {
+  let testPage =
+    "data:text/html," +
+    '<textarea id="textarea">Write something here</textarea>';
+  let DOMWindowUtils = EventUtils._getDOMWindowUtils(window);
+  let selectedText;
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, testPage);
+  await BrowserTestUtils.synthesizeMouse(
+    "#textarea",
+    0,
+    0,
+    {},
+    gBrowser.selectedBrowser
+  );
+  await BrowserTestUtils.synthesizeKey(
+    "KEY_ArrowRight",
+    { shiftKey: true, ctrlKey: true },
+    gBrowser.selectedBrowser
+  );
+  selectedText = DOMWindowUtils.GetSelectionAsPlaintext();
+  is(
+    selectedText,
+    "Write something here",
+    "The macOS services got the selected content text"
+  );
+  gURLBar.value = "test.mozilla.org";
+  await gURLBar.editor.selectAll();
+  selectedText = DOMWindowUtils.GetSelectionAsPlaintext();
+  is(
+    selectedText,
+    "test.mozilla.org",
+    "The macOS services got the selected chrome text"
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+// Test switching active selection.
+// Each tab has a content selection and when you switch to that tab, its selection becomes
+// active aka the current selection.
+// Expect: The active selection is what is being sent to OSX service menu.
+
+add_task(async function test_active_selection_switches_properly() {
+  let testPage1 =
+    // eslint-disable-next-line no-useless-concat
+    "data:text/html," +
+    '<textarea id="textarea">Write something here</textarea>';
+  let testPage2 =
+    // eslint-disable-next-line no-useless-concat
+    "data:text/html," + '<textarea id="textarea">Nothing available</textarea>';
+  let DOMWindowUtils = EventUtils._getDOMWindowUtils(window);
+  let selectedText;
+
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, testPage1);
+  await BrowserTestUtils.synthesizeMouse(
+    "#textarea",
+    0,
+    0,
+    {},
+    gBrowser.selectedBrowser
+  );
+  await BrowserTestUtils.synthesizeKey(
+    "KEY_ArrowRight",
+    { shiftKey: true, ctrlKey: true },
+    gBrowser.selectedBrowser
+  );
+
+  let tab2 = await BrowserTestUtils.openNewForegroundTab(gBrowser, testPage2);
+  await BrowserTestUtils.synthesizeMouse(
+    "#textarea",
+    0,
+    0,
+    {},
+    gBrowser.selectedBrowser
+  );
+  await BrowserTestUtils.synthesizeKey(
+    "KEY_ArrowRight",
+    { shiftKey: true, ctrlKey: true },
+    gBrowser.selectedBrowser
+  );
+
+  await BrowserTestUtils.switchTab(gBrowser, tab1);
+  selectedText = DOMWindowUtils.GetSelectionAsPlaintext();
+  is(
+    selectedText,
+    "Write something here",
+    "The macOS services got the selected content text"
+  );
+
+  await BrowserTestUtils.switchTab(gBrowser, tab2);
+  selectedText = DOMWindowUtils.GetSelectionAsPlaintext();
+  is(
+    selectedText,
+    "Nothing available",
+    "The macOS services got the selected content text"
+  );
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});