If you have disabled JavaScript using a browser add-on that allows you to customize your JavaScript settings, you need to re-enable JavaScript using this add-on.
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JavaScript is enabled for all websites by default in Mozilla Firefox.
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To enable JavaScript for all websites that you visit using Google Chrome, refer to the instructions under Step 1: Turn on JavaScript in the following article from Google Chrome Help:
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To enable JavaScript and / or cookies, refer to the information in the relevant section below according to your web browser: This is because the Avast Store is unable to load and function correctly without these settings enabled. When you make a purchase via the Avast Store, you may be notified that you need to enable JavaScript and / or cookies in your web browser. Enabling JavaScript and cookies in your web browser