A video demo
On Windows, you don't commonly have to ask other windows about whether they want to be part of your Multi-Document Interface, so I wrote a little Windows Forms application that lets you set up columns and insert windows into them.
I also wrote a little browser extension so that the column can auto-expand when clicking on images on Twitter/Cohost/Mastodon.
The result is amusing - you can have feeds from different social networks, or different accounts, or even non-browser things all inside one "dashboard".