Add an option to install website with tabs

[PeterHevesi]

Hi, In Microsoft Edge on Windows, I can install apps with tabs (which is very nice for apps like YouTube for example, in which I may want to open multiple videos at the same time). (it can be turned on in edge://flags/)

Now it works like this:

1. When you click + button, it automatically opens the same website
2. It allows to opens links of the same website on other tabs in the app..
3. Tabs strip is not there if you don't explicitly turn it on

Would this functionality be possible to add? Thanks so much for this fantastic app and have a nice day :)