
I always return to Fluid - recently, I tried to find a suitable Twitter Mac Client and in the end, nothing was better than a Fluid shell.
I use it for FB Messenger, as Goofy had many problems. Medium, Bandcamp & Instagram work too.
This used to be one of my most used apps, still is to some extent, I use it for some web apps. But very unfortunately the dev abandoned it. Although the website says nothing of the fact, I think just one update was posted for the last couple of years and several emails with support questions / request remained ignored.
I use it to build an app link on my desktop for websites I use frequently