This add-on did save me a few dollars, but at the expense of slowing the browser down to a crawl. I could not figure out why everything was slow in Firefox, even thought it was my internet. (Hardly this at 85 Mbps Up/Down) I then thought to uninstall the add-on as I had recently installed it and boom! Firefox was back to its speedy ways. Stay far away if you enjoy not growing old waiting on pages to load.