Doesn't seem to be working anymore. I have a screenshot (https://imgur.com/a/tvPEZmR). Also is not working in Firefox on Windows and Mac. I also want to add that I did try and turn off all addons first. It is definitely SponsorBlock.
No longer works with Firefox. Will just freeze the video when it gets to the sponsor section until you manually skip it. However even if it isn't working it's still better than nothing since it shows when the sponsor ends.