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diff --git a/devtools/shared/tests/xpcshell/test_css-properties-db.js b/devtools/shared/tests/xpcshell/test_css-properties-db.js
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+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Test that the devtool's client-side CSS properties database is in sync with the values
+ * on the platform (in Nightly only). If they are not, then `mach devtools-css-db` needs
+ * to be run to make everything up to date. Nightly, aurora, beta, and release may have
+ * different CSS properties and values. These are based on preferences and compiler flags.
+ *
+ * This test broke uplifts as the database needed to be regenerated every uplift. The
+ * combination of compiler flags and preferences means that it's too difficult to
+ * statically determine which properties are enabled between Firefox releases.
+ *
+ * Because of these difficulties, the database only needs to be up to date with Nightly.
+ * It is a fallback that is only used if the remote debugging protocol doesn't support
+ * providing a CSS database, so it's ok if the provided properties don't exactly match
+ * the inspected target in this particular case.
+ */
+
+"use strict";
+
+const {
+  PSEUDO_ELEMENTS,
+  CSS_PROPERTIES,
+} = require("resource://devtools/shared/css/generated/properties-db.js");
+const PREFERENCES = InspectorUtils.getCSSPropertyPrefs();
+const {
+  generateCssProperties,
+} = require("resource://devtools/server/actors/css-properties.js");
+const { Preferences } = ChromeUtils.importESModule(
+  "resource://gre/modules/Preferences.sys.mjs"
+);
+
+function run_test() {
+  const propertiesErrorMessage =
+    "If this assertion fails, then the client side CSS " +
+    "properties list in devtools is out of sync with the " +
+    "CSS properties on the platform. To fix this " +
+    "assertion run `mach devtools-css-db` to re-generate " +
+    "the client side properties.";
+
+  // Check that the platform and client match for pseudo elements.
+  deepEqual(
+    PSEUDO_ELEMENTS,
+    InspectorUtils.getCSSPseudoElementNames(),
+    "The pseudo elements match on the client and platform. " +
+      propertiesErrorMessage
+  );
+
+  /**
+   * Check that the platform and client match for the details on their CSS properties.
+   * Enumerate each property to aid in debugging. Sometimes these properties don't
+   * completely agree due to differences in preferences. Check the currently set
+   * preference for that property to see if it's enabled.
+   */
+  const platformProperties = generateCssProperties();
+
+  for (const propertyName in CSS_PROPERTIES) {
+    const platformProperty = platformProperties[propertyName];
+    const clientProperty = CSS_PROPERTIES[propertyName];
+    const deepEqual = isJsonDeepEqual(platformProperty, clientProperty);
+
+    if (deepEqual) {
+      ok(true, `The static database and platform match for "${propertyName}".`);
+    } else {
+      ok(
+        false,
+        `The static database and platform do not match for ` +
+          `
+        "${propertyName}". ${propertiesErrorMessage}`
+      );
+    }
+  }
+
+  /**
+   * Check that the list of properties on the platform and client are the same. If
+   * they are not, check that there may be preferences that are disabling them on the
+   * target platform.
+   */
+  const mismatches = getKeyMismatches(platformProperties, CSS_PROPERTIES)
+    // Filter out OS-specific properties.
+    .filter(name => name && !name.includes("-moz-osx-"));
+
+  if (mismatches.length === 0) {
+    ok(
+      true,
+      "No client and platform CSS property database mismatches were found."
+    );
+  }
+
+  mismatches.forEach(propertyName => {
+    if (getPreference(propertyName) === false) {
+      ok(
+        true,
+        `The static database and platform do not agree on the property ` +
+          `"${propertyName}" This is ok because it is currently disabled through ` +
+          `a preference.`
+      );
+    } else {
+      ok(
+        false,
+        `The static database and platform do not agree on the property ` +
+          `"${propertyName}" ${propertiesErrorMessage}`
+      );
+    }
+  });
+}
+
+/**
+ * Check JSON-serializable objects for deep equality.
+ */
+function isJsonDeepEqual(a, b) {
+  // Handle primitives.
+  if (a === b) {
+    return true;
+  }
+
+  // Handle arrays.
+  if (Array.isArray(a) && Array.isArray(b)) {
+    if (a.length !== b.length) {
+      return false;
+    }
+    for (let i = 0; i < a.length; i++) {
+      if (!isJsonDeepEqual(a[i], b[i])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  // Handle objects
+  if (typeof a === "object" && typeof b === "object") {
+    for (const key in a) {
+      if (!isJsonDeepEqual(a[key], b[key])) {
+        return false;
+      }
+    }
+
+    return Object.keys(a).length === Object.keys(b).length;
+  }
+
+  // Not something handled by these cases, therefore not equal.
+  return false;
+}
+
+/**
+ * Take the keys of two objects, and return the ones that don't match.
+ *
+ * @param {Object} a
+ * @param {Object} b
+ * @return {Array} keys
+ */
+function getKeyMismatches(a, b) {
+  const aNames = Object.keys(a);
+  const bNames = Object.keys(b);
+  const aMismatches = aNames.filter(key => !bNames.includes(key));
+  const bMismatches = bNames.filter(key => {
+    return !aNames.includes(key) && !aMismatches.includes(key);
+  });
+
+  return aMismatches.concat(bMismatches);
+}
+
+/**
+ * Get the preference value of whether this property is enabled. Returns an empty string
+ * if no preference exists.
+ *
+ * @param {String} propertyName
+ * @return {Boolean|undefined}
+ */
+function getPreference(propertyName) {
+  const preference = PREFERENCES.find(({ name, pref }) => {
+    return name === propertyName && !!pref;
+  });
+
+  if (preference) {
+    return Preferences.get(preference.pref);
+  }
+  return undefined;
+}