I've previously complained about the bad usability that Stack Exchange sites can have and created a Chrome extension to help test possible fixes. It did not attract much attention.
Now I've added a extra features and general improvements (see below).
Comments and suggestions are welcomed, as well as contributions.
The extension is published at GitHub, so anyone can open a pull request with new features or improvements on the current ones.
I would like to know if someone is missing any important feature that he or she thinks that should be introduced as soon as possible.
The main improvements made so far are in the editor, as you can see in this screenshot: