Prisión Espacial is a Chrome extension developed by mendru that serves the purpose of eliminating unwanted pop-up pages. This add-on is designed to close undesirable windows by vetoing a series of strings in the URL.

When a tab is updated, Prisión Espacial checks if it contains any of the vetoed strings and, if so, it automatically closes the tab. The usage mechanism is incredibly straightforward - simply click on the extension's icon to access a list of vetoed sites. To add a new site, enter a significant part of the URL and click the "Add" button. All pages with URLs containing that text will be closed. Removing an entry from the list is just as simple - click on it, and it will disappear instantly.

The latest update of Prisión Espacial introduces a closed tab counter and the option to temporarily deactivate the extension. Curious about the name's origin? Press CTRL+[,] simultaneously to find out.