what are content scripts in chrome inspector
In Google Chrome, content scripts are JavaScript files that are part of browser extensions. They operate on the web page much like regular javascript does, but from a protected scope (Google calls it an "Isolated World").
Content scripts have a few more privileges than ordinary javascript and, for that reason, content-script JS and page JS cannot ordinarily interact with each other.
When looking at that Content Scripts tab, you will see both the scripts added by any extensions (or by userscripts which are compiled into extensions in Chrome), and also content scripts that are built-in parts of the browser, specifically the API that extensions can use.
You can match extensions to those "random numbers" by opening the extensions tab (chrome://chrome/extensions), and activating Developer mode:
