I will surely test it this weekend, thanks for the update.
Sorry if I am going a little off-topic: recently XF has released a new update which also includes the option to install the app (PWA APP). To my surprise there is no cache, or at least I wasn't able to use it off-line.
Another thing is that requires https connection, I guess it's the same for elk pwa. If so I suggest to add this information into the first post of this topic.
Another suggestion is to remove the old versions of this add-on.
Thanks again!