diff --git a/background/parserlib-loader.js b/background/parserlib-loader.js
deleted file mode 100644
index 8275e8fd..00000000
--- a/background/parserlib-loader.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/* global importScripts parserlib CSSLint parseMozFormat */
-'use strict';
-
-importScripts('/vendor-overwrites/csslint/parserlib.js', '/js/moz-parser.js');
-parserlib.css.Tokens[parserlib.css.Tokens.COMMENT].hide = false;
-
-self.onmessage = ({data}) => {
-  self.postMessage(parseMozFormat(data));
-};