diff --git a/browser/components/aboutwelcome/karma.mc.config.js b/browser/components/aboutwelcome/karma.mc.config.js
index 4ec714360124..5ecfdfd6a342 100644
--- a/browser/components/aboutwelcome/karma.mc.config.js
+++ b/browser/components/aboutwelcome/karma.mc.config.js
@@ -4,7 +4,7 @@
 
 const path = require("path");
 const webpack = require("webpack");
-const { ResourceUriPlugin } = require("../newtab/tools/resourceUriPlugin");
+const { ResourceUriPlugin } = require("../../tools/resourceUriPlugin");
 
 const PATHS = {
   // Where is the entry point for the unit tests?
diff --git a/browser/components/asrouter/karma.mc.config.js b/browser/components/asrouter/karma.mc.config.js
index a544dbe58303..5b91278909b5 100644
--- a/browser/components/asrouter/karma.mc.config.js
+++ b/browser/components/asrouter/karma.mc.config.js
@@ -4,7 +4,7 @@
 
 const path = require("path");
 const webpack = require("webpack");
-const { ResourceUriPlugin } = require("../newtab/tools/resourceUriPlugin");
+const { ResourceUriPlugin } = require("../../tools/resourceUriPlugin");
 
 const PATHS = {
   // Where is the entry point for the unit tests?
diff --git a/browser/components/newtab/karma.mc.config.js b/browser/components/newtab/karma.mc.config.js
index 2d1598890694..4550343420f0 100644
--- a/browser/components/newtab/karma.mc.config.js
+++ b/browser/components/newtab/karma.mc.config.js
@@ -4,7 +4,7 @@
 
 const path = require("path");
 const webpack = require("webpack");
-const { ResourceUriPlugin } = require("./tools/resourceUriPlugin");
+const { ResourceUriPlugin } = require("../../tools/resourceUriPlugin");
 
 const PATHS = {
   // Where is the entry point for the unit tests?
diff --git a/browser/components/newtab/webpack.system-addon.config.js b/browser/components/newtab/webpack.system-addon.config.js
index 2f72da87e88d..88535f50a084 100644
--- a/browser/components/newtab/webpack.system-addon.config.js
+++ b/browser/components/newtab/webpack.system-addon.config.js
@@ -4,7 +4,7 @@
 
 const path = require("path");
 const webpack = require("webpack");
-const { ResourceUriPlugin } = require("./tools/resourceUriPlugin");
+const { ResourceUriPlugin } = require("../../tools/resourceUriPlugin");
 
 const absolute = relPath => path.join(__dirname, relPath);
 
diff --git a/browser/components/newtab/tools/resourceUriPlugin.js b/browser/tools/resourceUriPlugin.js
similarity index 96%
rename from browser/components/newtab/tools/resourceUriPlugin.js
rename to browser/tools/resourceUriPlugin.js
index a2244f27fa6f..1eca7ff85b15 100644
--- a/browser/components/newtab/tools/resourceUriPlugin.js
+++ b/browser/tools/resourceUriPlugin.js
@@ -6,6 +6,7 @@
 // and translating the uri into a relative filesytem path where the file may be
 // found when running within the Karma / Mocha test framework.
 
+/* eslint-env node */
 const path = require("path");
 
 module.exports = {
@@ -29,6 +30,7 @@ module.exports = {
 
     /**
      * @param {object} options
+     *  Object passed during the instantiation of ResourceUriPlugin
      * @param {ResourceReplacement[]} options.resourcePathRegExes
      *   An array of regex/string tuples to perform replacements on for
      *   imports involving resource:// URIs.