Hey, this isn't working in FF for me - FF 106.0, MacOS 12.6. I thought it might be an extension, but I've tried turning off the expected culprits and nothing changes. I'm not ruling out combinations of extensions, but I'm also not going to try 30! combinations.

It looks great on Safari, though! Though I do echo the sentiment that it would be great to allow customization - let me choose the columns I want and where I want them in a layout panel.