32, late diagnosed autistic. This is how I got into software development back in the day. Opera circa 2007 had a feature where viewing a page's source also let you edit it and update the page live. Neither Firefox or Chrome today have the feature as it existed in Opera. The inspector we have today is probably better overall though.

The first project I ever completed and shared with others was a userstyle that replaced a forum's ugly dithered gif gradients with much more modern pngs (`linear-gradient` didn't exist yet).