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diff --git a/browser/extensions/webcompat/injections/js/bug1799980-healow.com-infinite-loop-fix.js b/browser/extensions/webcompat/injections/js/bug1799980-healow.com-infinite-loop-fix.js
new file mode 100644
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+++ b/browser/extensions/webcompat/injections/js/bug1799980-healow.com-infinite-loop-fix.js
@@ -0,0 +1,37 @@
+/* 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/. */
+
+"use strict";
+
+/**
+ * Bug 1799980 - Healow gets stuck in an infinite loop while pages load
+ *
+ * This patch keeps Healow's localization scripts from getting stuck in
+ * an infinite loop while their pages are loading.
+ *
+ * This happens because they use synchronous XMLHttpRequests to fetch a
+ * JSON file with their localized text on the first call to their i18n
+ * function, and then force subsequent calls to wait for it by waiting
+ * in an infinite loop.
+ *
+ * But since they're in an infinite loop, the code after the syncXHR will
+ * never be able to run, so this ultimately triggers a slow script warning.
+ *
+ * We can improve this by just preventing the infinite loop from happening,
+ * though since they disable caching on their JSON files it means that more
+ * XHRs may happen. But since those files are small, this seems like a
+ * reasonable compromise until they migrate to a better i18n solution.
+ *
+ * See https://bugzilla.mozilla.org/show_bug.cgi?id=1799980 for details.
+ */
+
+/* globals exportFunction */
+
+Object.defineProperty(window.wrappedJSObject, "ajaxRequestProcessing", {
+  get: exportFunction(function () {
+    return false;
+  }, window),
+
+  set: exportFunction(function () {}, window),
+});