The correct options are github.dev editor and GitHub Codespaces because both allow contributors to edit files and submit changes entirely in a web browser without setting up a local environment.

With Codespaces developers get a full cloud hosted development environment in the browser that uses a familiar editor and supports terminals and extensions. They can edit files, create branches, commit changes, and open pull requests without installing anything locally. Repository owners can use dev containers and prebuilds so Codespaces starts quickly and is consistent for all contributors.

The github.dev web editor opens instantly from any repository and provides a lightweight editing experience in the browser. It does not run servers or tasks, yet it lets users edit files, create a branch, and propose a pull request directly on GitHub, which is ideal for small fixes and documentation changes.

GitHub Projects is a planning and tracking tool for issues and work items and it does not provide a code editing experience in the browser.

GitHub Dependabot automates dependency updates and security alerts and it may open pull requests, but it does not let contributors interactively edit arbitrary source files in a browser.

Google Cloud Shell Editor is a Google Cloud service and not a GitHub capability, so it is outside the GitHub platform and is not what enables browser based editing of files in a GitHub repository.

GitHub Mobile focuses on notifications, reviews, and lightweight triage while the app is not designed for full code editing and committing workflows.

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