Web workers and service workers are both types of JavaScript workers used in web development to perform tasks in the background, separate from the main web page's thread.
Can break things
Web/service workers don't allow the injection of content scripts, so they can still determine your browser's timezone and language settings. If this is a concern, you can enable this blocker. However, be mindful that this can break certain websites.
This feature will disable web/service workers inside your browser. This can break some websites, so don't enable this feature unless you know what you're doing.