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diff --git a/comm/mail/test/browser/composition/browser_remove_text_styling.js b/comm/mail/test/browser/composition/browser_remove_text_styling.js
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+++ b/comm/mail/test/browser/composition/browser_remove_text_styling.js
@@ -0,0 +1,136 @@
+/* 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/. */
+
+/**
+ * Test removing styling from messages.
+ */
+
+var { close_compose_window, open_compose_new_mail, FormatHelper } =
+  ChromeUtils.import("resource://testing-common/mozmill/ComposeHelpers.jsm");
+
+add_task(async function test_remove_text_styling() {
+  let controller = open_compose_new_mail();
+  let formatHelper = new FormatHelper(controller.window);
+
+  const NO_SIZE = formatHelper.NO_SIZE;
+
+  let removeButton = formatHelper.removeStylingButton;
+  let removeItem = formatHelper.removeStylingMenuItem;
+
+  // Before focus.
+  Assert.ok(
+    removeButton.disabled,
+    "Remove button should be disabled before focus"
+  );
+
+  formatHelper.focusMessage();
+
+  Assert.ok(
+    !removeButton.disabled,
+    "Remove button should be enabled after focus"
+  );
+
+  async function assertShown(styleSet, font, size, color, state, message) {
+    await formatHelper.assertShownStyles(styleSet, message);
+    await formatHelper.assertShownFont(font, message);
+    await formatHelper.assertShownSize(size, message);
+    await formatHelper.assertShownColor(color, message);
+    await formatHelper.assertShownParagraphState(state, message);
+  }
+
+  let styleSet = [
+    formatHelper.styleDataMap.get("underline"),
+    formatHelper.styleDataMap.get("superscript"),
+    formatHelper.styleDataMap.get("strong"),
+  ];
+  let tags = new Set();
+  styleSet.forEach(style => tags.add(style.tag));
+
+  let color = { value: "#0000ff", rgb: [0, 0, 255] };
+  let font = formatHelper.commonFonts[0];
+  let size = 4;
+
+  // In paragraph state.
+
+  for (let style of styleSet) {
+    await formatHelper.selectStyle(style);
+  }
+  await formatHelper.selectColor(color.value);
+  await formatHelper.selectFont(font);
+  await formatHelper.selectSize(size);
+
+  let text = "some text to apply styling to";
+  await formatHelper.typeInMessage(text);
+
+  formatHelper.assertMessageParagraph(
+    [{ tags, color: color.value, font, size, text }],
+    "Initial styled text"
+  );
+  await assertShown(styleSet, font, size, color, "p", "Set styling and typing");
+
+  removeButton.click();
+  await assertShown(null, "", NO_SIZE, "", "p", "Clicked to stop style");
+
+  let moreText = " without any styling";
+  await formatHelper.typeInMessage(moreText);
+  await assertShown(null, "", NO_SIZE, "", "p", "Typing with no styling");
+
+  formatHelper.assertMessageParagraph(
+    [{ tags, color: color.value, font, size, text }, moreText],
+    "Unstyled at end"
+  );
+
+  // Initialize some styling for the next typed character.
+  // Don't select any Text Styles because of Bug 1716840.
+  // for (let style of styleSet) {
+  //   await formatHelper.selectStyle(style);
+  // }
+  await formatHelper.selectColor(color.value);
+  await formatHelper.selectFont(font);
+  await formatHelper.selectSize(size);
+
+  await assertShown(null, font, size, color, "p", "Getting some styling ready");
+
+  // Select through menu.
+  await formatHelper.selectFromFormatMenu(removeItem);
+  await assertShown(null, "", NO_SIZE, "", "p", "Removed readied styling");
+
+  await formatHelper.typeInMessage("a");
+  moreText += "a";
+  await assertShown(null, "", NO_SIZE, "", "p", "Still unstyled when typing");
+
+  formatHelper.assertMessageParagraph(
+    [{ tags, color: color.value, font, size, text }, moreText],
+    "Remains unstyled at end"
+  );
+
+  await formatHelper.selectTextRange(0, 3);
+  await assertShown(styleSet, font, size, color, "p", "Select start");
+
+  removeButton.click();
+  await assertShown(null, "", NO_SIZE, "", "p", "Selection is unstyled");
+  formatHelper.assertMessageParagraph(
+    [
+      text.slice(0, 3),
+      { tags, color: color.value, font, size, text: text.slice(3) },
+      moreText,
+    ],
+    "Becomes unstyled at start"
+  );
+
+  await formatHelper.selectTextRange(1, text.length + 3);
+  // Mixed selection
+  // See Bug 1718227 (the size menu does not respond to mixed selections)
+  // await assertShown(null, null, null, null, "p", "Select mixed");
+
+  // Select through menu.
+  await formatHelper.selectFromFormatMenu(removeItem);
+  await assertShown(null, "", NO_SIZE, "", "p", "Mixed selection now unstyled");
+  formatHelper.assertMessageParagraph(
+    [text + moreText],
+    "Style is fully stripped"
+  );
+
+  close_compose_window(controller);
+});