The correct option is Change the browser URL from github.com to github.dev.

This method opens the repository directly in the web-based editor in the browser and it works from repository, file, commit, and pull request views. It does not require installing anything and it avoids the need for a keyboard shortcut when the period key is not available.

Use the Extensions view is incorrect because this view manages extensions inside an editor session and it does not launch the browser editor from a repository page.

Open Cloud Shell Editor and clone the repository is incorrect because that is a different cloud editor from another service and it requires cloning into a separate environment rather than opening the GitHub web editor for the current repository.

Press Alt plus Up Arrow is incorrect because this is not a GitHub action to open the browser editor and it is typically a navigation shortcut inside editors instead.

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