You are the end result of a “would you push the button” prompt where the prompt was “you have unlimited godlike powers but you appear to all and sundry to be an impetuous child” – Zero, 2022
Turns out it's not actually a plugin at all. It's a new feature in Firefox 11 that is supposedly meant to help web developers see how the different elements of a page come together (which is likely why they're color-coded like that) but in reality is just fun to look at.
Comments
Hmm... Seems like each html tag can add a new layer...
THINK OF THE POSSIBILITIES! We can make THREE DIMENSIONAL ASCII ART!
Web development tools aren't ALLOWED to be fun!
And I'm going to try to make 3D pixel art with it 8D
Too bad I need sleepytime right now :<