Setup was bit of a hassle as despite the setup page saying otherwise, it never installed 7zip for me.
So i was stuck there for a moment.
Then the addon didn't appear around the other add-ons, so i couldn't make pwa's on every page I wanted.
But later it just appeared next to ublock origin in the user interface.
From there it did make it possible for me to create pwa's from every page I wanted, so while installation was bit complicated hassle it does everything that it promises to.
So 5/5 addon in my book.