This is fantastic! I've recently decided to begin reading web browser source code, even though I understand very little of it at the moment.

For now, what's been fun is to load up the same file in both Chromium and Firefox source, and compare the two and how both browsers work.

Chromium source: https://cs.chromium.org/chromium/src/third_party/WebKit/Sour...

Firefox source: https://dxr.mozilla.org/mozilla-central/source/