Markdown Viewer - Simple & Secure is a free Chrome extension designed for developers looking for a straightforward way to view Markdown files. It offers a user-friendly interface with six clean themes, including Light, Dark, and GitHub styles. This extension supports GitHub Flavored Markdown (GFM), featuring syntax highlighting, Mermaid diagrams, and Math equations using MathJax. Users can toggle between rendered and raw Markdown views and utilize frontmatter support for YAML parsing. The hot reload feature automatically detects file changes, enhancing user experience without the need for complex configurations.

Security is a core aspect of this extension, as it is designed to minimize risks associated with browser extensions. It reads local Markdown files and stores settings locally without collecting or tracking any user data. The permissions required are limited and justified, focusing solely on functionalities like storage and active tab rendering. This open-source tool ensures that users can trust its operation, providing a safe environment to work with Markdown files.