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diff --git a/devtools/shared/loader/loader-plugin-raw.sys.mjs b/devtools/shared/loader/loader-plugin-raw.sys.mjs
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+/* 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/. */
+
+const { NetUtil } = ChromeUtils.import("resource://gre/modules/NetUtil.jsm");
+
+/**
+ * A function that can be used as part of a require hook for a
+ * loader.js Loader.
+ * This function handles "raw!" and "theme-loader!" requires.
+ * See also: https://github.com/webpack/raw-loader.
+ */
+export const requireRawId = function (id, require) {
+ const index = id.indexOf("!");
+ const rawId = id.slice(index + 1);
+ let uri = require.resolve(rawId);
+ // If the original string did not end with ".js", then
+ // require.resolve might have added the suffix. We don't want to
+ // add a suffix for a raw load (if needed the caller can specify it
+ // manually), so remove it here.
+ if (!id.endsWith(".js") && uri.endsWith(".js")) {
+ uri = uri.slice(0, -3);
+ }
+
+ const stream = NetUtil.newChannel({
+ uri: NetUtil.newURI(uri, "UTF-8"),
+ loadUsingSystemPrincipal: true,
+ }).open();
+
+ const count = stream.available();
+ const data = NetUtil.readInputStreamToString(stream, count, {
+ charset: "UTF-8",
+ });
+ stream.close();
+
+ // For the time being it doesn't seem worthwhile to cache the
+ // result here.
+ return data;
+};