Seems to function. And I find many of the complaints unreasonable:

I was happy to receive the announcement that "Tile Tabs won't work but Tile Tabs WE will". It's better than having it stop working without warning in FF57, and this *DOES* seem to be the closest thing to replacement possible. The implementation is different (separate windows instead of a single window) but the functionality is the pretty much the same.

Yes, you can, by hand, make separate windows and resize them to make separate tiles, but it's a lot more difficult, especially if you're trying to compare 5 or 6 different but related products. And you can save arbitrarily complex layouts.

Your handmade windows are pretty useless if you need to do a synchronized scroll.

I don't notice any performance difference.