It works but I'm removing two stars because 1. it randomly opened its homepage while I was trying to watch a YouTube video full screen (probably because I have automatic updates turn on...but why does it need to open a website and distract me) and 2, it says Firefox does not recommend this extension and that it could be malicious. This has me worried it could be stealing my data. However for such a simple feature this extension brings, I may look for an alternative that is trusted and does not randomly open their website on my computer.