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diff --git a/devtools/client/shared/test/browser_filter-editor-04.js b/devtools/client/shared/test/browser_filter-editor-04.js
new file mode 100644
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+++ b/devtools/client/shared/test/browser_filter-editor-04.js
@@ -0,0 +1,106 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests the Filter Editor Widget's drag-drop re-ordering
+
+const {
+  CSSFilterEditorWidget,
+} = require("resource://devtools/client/shared/widgets/FilterWidget.js");
+const LIST_ITEM_HEIGHT = 32;
+
+const TEST_URI = CHROME_URL_ROOT + "doc_filter-editor-01.html";
+
+add_task(async function () {
+  const { doc } = await createHost("bottom", TEST_URI);
+
+  const container = doc.querySelector("#filter-container");
+  const initialValue = "blur(2px) contrast(200%) brightness(200%)";
+  const widget = new CSSFilterEditorWidget(container, initialValue);
+
+  const filters = widget.el.querySelector("#filters");
+  function first() {
+    return filters.children[0];
+  }
+  function mid() {
+    return filters.children[1];
+  }
+  function last() {
+    return filters.children[2];
+  }
+
+  info("Test re-ordering neighbour filters");
+  widget._mouseDown({
+    target: first().querySelector("i"),
+    pageY: 0,
+  });
+  widget._mouseMove({ pageY: LIST_ITEM_HEIGHT });
+
+  // Element re-ordering should be instant
+  is(
+    mid().querySelector("label").textContent,
+    "blur",
+    "Should reorder elements correctly"
+  );
+
+  widget._mouseUp();
+
+  is(
+    widget.getCssValue(),
+    "contrast(200%) blur(2px) brightness(200%)",
+    "Should reorder filters objects correctly"
+  );
+
+  info("Test re-ordering first and last filters");
+  widget._mouseDown({
+    target: first().querySelector("i"),
+    pageY: 0,
+  });
+  widget._mouseMove({ pageY: LIST_ITEM_HEIGHT * 2 });
+
+  // Element re-ordering should be instant
+  is(
+    last().querySelector("label").textContent,
+    "contrast",
+    "Should reorder elements correctly"
+  );
+  widget._mouseUp();
+
+  is(
+    widget.getCssValue(),
+    "brightness(200%) blur(2px) contrast(200%)",
+    "Should reorder filters objects correctly"
+  );
+
+  info("Test dragging first element out of list");
+  const boundaries = filters.getBoundingClientRect();
+
+  widget._mouseDown({
+    target: first().querySelector("i"),
+    pageY: 0,
+  });
+  widget._mouseMove({ pageY: -LIST_ITEM_HEIGHT * 5 });
+  Assert.greaterOrEqual(
+    first().getBoundingClientRect().top,
+    boundaries.top,
+    "First filter should not move outside filter list"
+  );
+
+  widget._mouseUp();
+
+  info("Test dragging last element out of list");
+  widget._mouseDown({
+    target: last().querySelector("i"),
+    pageY: 0,
+  });
+  widget._mouseMove({ pageY: -LIST_ITEM_HEIGHT * 5 });
+  Assert.lessOrEqual(
+    last().getBoundingClientRect().bottom,
+    boundaries.bottom,
+    "Last filter should not move outside filter list"
+  );
+
+  widget._mouseUp();
+  widget.destroy();
+});