Used on chrome, had good reviews there, saw the reviews on firefox and skipped it but now I've completely stopped using chrome I thought I'd give it a go. Previous review to mine says it messes up the layout, I don't see the issue.

Sometimes it bugs out and doesn't pull the demo, but only when I'm trying to add lot's of matches at once. I think that's a faceit issue and even when this happens it's still a lot faster than manually downloading and uploading demos. Good extention!