Is it like a browser with a nice side bar? On a careful thought I would love such a sidebar with my favourite apps on chrome / firefox.
I think that is not possible with the help of extensions. I would love to be corrected though.
I believe the crucial difference is that "tabs" do not share runtime data like cookies, but are isolated. That effectively means you have multiple browsers, one running for each tab.
What's the difference between Franz, Ferdi, Ferdium?