Directory listing appears to be broken: I see pages without content when trying to browse directories [1]; observed on a few instances I tried, with a few repositories.
The code div is restricted to something like 50 characters, leading to line wrapping, if the browser window is at a width allowing about 150 characters; huge and unnecessary margins there, particularly awkward for code.
Looks like it may be nice and useful though, especially if it had a working search on top of browsing: GitHub's new search is tiring to use for skimming a new codebase now, and cloning large repositories for such skimming is inconvenient.
[1] https://gothub.frontendfriendly.xyz/microsoft/vscode/tree/ma...