A long time ago, I saw some people who were able to do this, and I was impressed and I dcidi look more, I ended up finding nothing. Already disappointed, I started to only use the turbowarp.

However, a few days ago, I saw some vulneabilities that Scratch's online editor has reaction with Blockly.

But is it possible to use/send to the editor a custom extension by the console?

Yes! Check out https://scratch-mit-edu.ezproxy.canberra.edu.au/projects/717031217/

i dont know, but you can use turbowarp, it has a lot more extensions than scratch!

try this: https://scratch-mit-edu.ezproxy.canberra.edu.au/projects/955635256/ it uses all scratch exstensions!