Light MD Viewer is a Firefox extension that renders and edits Markdown files directly in the browser. It provides CodeMirror editing, split-pane live previews, syntax highlighting, Mermaid diagrams, export options, and offline operation.
In the Markdown & writing editors space, Light MD Viewer takes a focused approach. It focuses on viewing and editing Markdown files in a browser without external tools or network access. Light MD Viewer is a consumer product aimed at firefox users who work with Markdown files. Light MD Viewer costs nothing to use. It runs on the web and embeddable surfaces.
It is developed by Hayyarden, and it first shipped in 2026. Among its 9 catalogued features are markdown viewing, markdown editing, and split preview. The interface is available in 32 languages, including Czech, German, and Greek.
Summary written by a language model from the project’s public pages.
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