Broke Firefox/Waterfox Rated 1 out of 5 stars

I have the latest versions of both Firefox/Waterfox and after installing this add-on, neither would actually work. They would come on and could be seen @ Task Manager's Processes tab, but the browser would never pop up. Tried a few things, including going into Window's Safe Mode, but nothing worked and the problem persisted. Finally, through process of elimination figured out that this add-on was the issue and that you can start Firefox/Waterfox in their "Safe Mode" simply by holding down SHIFT as you start either one. That finally did the trick as I was able to disable/remove this add-on. All this hassle because of this one piece of bad software. Thumbs down.