After the extension was acquired by Avast, there's no way to contact the authors, while the /report form on the website doesn't show a valid security question so there's no way to report an issue anymore. So I'll report here: https://orzeczenia.ms.gov.pl/content/$N/154505000001503_V_Ca_002184_2019_Uz_2021-10-06_001 can't load (invalid response) several css and js files while you have the extension enabled for the website. You disable it for the page and all the files are loaded and cached on first refresh and the page displays properly.