forge

Feature 2 is really useful. When I land on a technical article I know chances are there will be a nice HN discussion, that may sometimes even refute the main point of the article. Feature 1 is IMO less useful. It just suggests that people are bad at window management. We didn't like overlapping windows and finding them, so we created tabs inside windows. Then we wanted to see two things at the same time, so we created split views inside tabs (Chrome and Firefox both had this). With a good window manager neither would be necessary. Sadly the community prefers to solve this at the application level rather than the desktop level; I'm currently using Forge (https://github.com/forge-ext/forge) but sadly it's becoming unmaintained.

Have a look at this gnome shell extension: https://github.com/forge-ext/forge