ISH Whitelist-Block by install.sh

ISH Whitelist is a lightweight blocker for Firefox. It allows you to restrict browsing to a user-defined whitelist of websites and helps preserve profile specific browsing contexts.

Useful for privacy-focused Firefox users who work with multiple browser profiles and want to keep browsing contexts separated. ISH Whitelist helps restrict each profile to its intended websites and avoid accidental cross-context browsing.

When a visited website is not on the whitelist, the browser redirects it to the first whitelist entry. If the whitelist is empty, no websites are blocked.

The add-on provides a small browser popup where you can add, remove, edit, and reorder whitelist entries.

Simple by design: focused and free from unnecessary option or menu overload.