AFAIK , Ghostery and Lightbeam both are somewhat equal in working. What difference as I know that ghostery having some inbuilt functionality to block or whitelist those websites that you are visiting . while lightbeam only do like '''Watch the Watchers''' and tell you graphically about third party connections. so, if you are using ghostery then it can helpful for faster loading of websites because you are blocking unusual stuffs from website ,while lightbeam don't do any thing with the website. Firefox is saying about lightbeam because of > It is made with our awesome developers,with completely understanding the User experience part. >Since It is nothing to do with websites so, as a website owner perspective you can show ads on your browser,without external permission of changes. Tracking and Privacy part. Have a look on https://www.ghostery.com/en/ to know about Ghostery and Lightbeam is accessible via https://www.mozilla.org/en-US/lightbeam/ .