--- a/devtools/client/debugger/jest-test.config.js
+++ b/devtools/client/debugger/jest-test.config.js
@@ -38,12 +38,13 @@ module.exports = {
     "enzyme-to-json/serializer",
   ],
   moduleNameMapper: {
     "\\.css$": "<rootDir>/src/test/__mocks__/styleMock.js",
     "\\.svg$": "<rootDir>/src/test/__mocks__/svgMock.js",
     "^Services": "<rootDir>/src/test/fixtures/Services",
     "^chrome": "<rootDir>/src/test/fixtures/Chrome",
     "^ChromeUtils": "<rootDir>/src/test/fixtures/ChromeUtils",
+    "\\/plural-form$": "<rootDir>/src/test/fixtures/plural-form",
     // Map all require("devtools/...") to the real devtools root.
     "^devtools\\/(.*)": "<rootDir>/../../$1",
   },
 };

--- a/devtools/client/debugger/src/components/Editor/SearchBar.js
+++ b/devtools/client/debugger/src/components/Editor/SearchBar.js
@@ -26,17 +26,19 @@ import { scrollList } from "../../utils/
 import classnames from "classnames";
 
 import type { Source, Context } from "../../types";
 import type { Modifiers, SearchResults } from "../../reducers/file-search";
 
 import SearchInput from "../shared/SearchInput";
 import { debounce } from "lodash";
 import "./SearchBar.css";
-import { PluralForm } from "devtools-modules";
+
+// $FlowIgnore
+const { PluralForm } = require("devtools/shared/plural-form");
 
 import type SourceEditor from "../../utils/editor/source-editor";
 
 function getShortcuts() {
   const searchAgainKey = L10N.getStr("sourceSearch.search.again.key3");
   const searchAgainPrevKey = L10N.getStr("sourceSearch.search.againPrev.key3");
   const searchKey = L10N.getStr("sourceSearch.search.key2");
 

--- a/devtools/client/debugger/src/components/ProjectSearch.js
+++ b/devtools/client/debugger/src/components/ProjectSearch.js
@@ -26,17 +26,19 @@ import {
 import ManagedTree from "./shared/ManagedTree";
 import SearchInput from "./shared/SearchInput";
 import AccessibleImage from "./shared/AccessibleImage";
 
 import type { List } from "immutable";
 import type { ActiveSearchType } from "../reducers/types";
 import type { StatusType } from "../reducers/project-text-search";
 import type { Context, SourceId } from "../types";
-import { PluralForm } from "devtools-modules";
+
+// $FlowIgnore
+const { PluralForm } = require("devtools/shared/plural-form");
 
 import "./ProjectSearch.css";
 
 export type Match = {
   type: "MATCH",
   sourceId: SourceId,
   line: number,
   column: number,

new file mode 100644
--- /dev/null
+++ b/devtools/client/debugger/src/test/fixtures/plural-form.js
@@ -0,0 +1,11 @@
+/* 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";
+
+module.exports.PluralForm = {
+  get(num, str) {
+    return str.split(";")[1];
+  },
+};