I've made this a while ago for myself to take quick notes while browsing the web, so I'm publishing this in case anyone finds it useful:
> minimalistab is an extension for Chrome that replaces chrome://newtab with a blank WYSIWYG editor for taking notes.
https://github.com/hakaneskici/minimalistab
Here's the primary trick [1] behind the scenes that makes this possible:
[1] https://news.ycombinator.com/item?id=43179649