After installing Query Strings Remover sure empty you cached resources in order to see the magic of this plugin.
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Worked great - just pop it in and GTMetrix reports that the the query strings are gone! Thanks!
https://wordpress.org/plugins/remove-query-strings-from-static-resources/ Compare the code, it's the same plugin. It even has the same code structure.
- Improved functionalities for WordPress 4.6 and above
- First release