There are bunch of interesting files accessible via chrome://resources/*
using google chrome.
On linux That the content is in /opt/google/chrome/r
The chrome-pak-customizer (pointed out by MrU in the comments above) seems to work well to unpack Chrome's .pak
files. If you're on Windows, you can download and unzip chrome-pak.7z
from the releases page. Then drop the .pak
file on the unpack.bat
script to unpack it.
For other platforms, it looks like you'll need to build the tool from the source.