Advanced Paraphrasing Tool not working in firefox

I try using Advanced Paraphrasing Tool at “AI Paraphrasing Tool | Free Paraphraser - LanguageTool
But it not working. When i try open Developer to check networking, i found your website can not connect to “https://rephraser.languagetool.org/rewriting/rewrite/simplicity” because Wrong CORS config
error_langai

Please fix, i like use it because it simple for me

P/s: i am premium member